diff --git a/crates/ruma-api/tests/manual_endpoint_impl.rs b/crates/ruma-api/tests/manual_endpoint_impl.rs
index bc1d516c..7a810796 100644
--- a/crates/ruma-api/tests/manual_endpoint_impl.rs
+++ b/crates/ruma-api/tests/manual_endpoint_impl.rs
@@ -18,8 +18,8 @@ use serde::{Deserialize, Serialize};
 /// A request to create a new room alias.
 #[derive(Debug)]
 pub struct Request {
-    pub room_id: RoomId,         // body
-    pub room_alias: RoomAliasId, // path
+    pub room_id: RoomId,              // body
+    pub room_alias: Box<RoomAliasId>, // path
 }
 
 impl Outgoing for Request {
diff --git a/crates/ruma-client-api/src/r0/directory.rs b/crates/ruma-client-api/src/r0/directory.rs
index 8bbd08e1..05e9ffce 100644
--- a/crates/ruma-client-api/src/r0/directory.rs
+++ b/crates/ruma-client-api/src/r0/directory.rs
@@ -17,11 +17,11 @@ use serde::{Deserialize, Serialize};
 pub struct PublicRoomsChunk {
     /// Aliases of the room.
     #[serde(default, skip_serializing_if = "Vec::is_empty")]
-    pub aliases: Vec<RoomAliasId>,
+    pub aliases: Vec<Box<RoomAliasId>>,
 
     /// The canonical alias of the room, if any.
     #[serde(skip_serializing_if = "Option::is_none")]
-    pub canonical_alias: Option<RoomAliasId>,
+    pub canonical_alias: Option<Box<RoomAliasId>>,
 
     /// The name of the room, if any.
     #[serde(skip_serializing_if = "Option::is_none")]
diff --git a/crates/ruma-client-api/src/r0/room/aliases.rs b/crates/ruma-client-api/src/r0/room/aliases.rs
index a59b2cff..9e3720e6 100644
--- a/crates/ruma-client-api/src/r0/room/aliases.rs
+++ b/crates/ruma-client-api/src/r0/room/aliases.rs
@@ -21,7 +21,7 @@ ruma_api! {
 
     response: {
         /// The server's local aliases on the room.
-        pub aliases: Vec<RoomAliasId>,
+        pub aliases: Vec<Box<RoomAliasId>>,
     }
 
     error: crate::Error
@@ -36,7 +36,7 @@ impl<'a> Request<'a> {
 
 impl Response {
     /// Creates a new `Response` with the given aliases.
-    pub fn new(aliases: Vec<RoomAliasId>) -> Self {
+    pub fn new(aliases: Vec<Box<RoomAliasId>>) -> Self {
         Self { aliases }
     }
 }
diff --git a/crates/ruma-client/src/lib.rs b/crates/ruma-client/src/lib.rs
index 41a334ed..4701e25c 100644
--- a/crates/ruma-client/src/lib.rs
+++ b/crates/ruma-client/src/lib.rs
@@ -61,7 +61,7 @@
 //!
 //! async {
 //!     let response = client
-//!         .send_request(get_alias::Request::new(&room_alias_id!("#example_room:example.com")))
+//!         .send_request(get_alias::Request::new(room_alias_id!("#example_room:example.com")))
 //!         .await?;
 //!
 //!     assert_eq!(response.room_id, room_id!("!n8f893n9:example.com"));
diff --git a/crates/ruma-common/src/directory.rs b/crates/ruma-common/src/directory.rs
index 1b875910..8574e51c 100644
--- a/crates/ruma-common/src/directory.rs
+++ b/crates/ruma-common/src/directory.rs
@@ -21,11 +21,11 @@ use serde_json::Value as JsonValue;
 pub struct PublicRoomsChunk {
     /// Aliases of the room.
     #[serde(default, skip_serializing_if = "Vec::is_empty")]
-    pub aliases: Vec<RoomAliasId>,
+    pub aliases: Vec<Box<RoomAliasId>>,
 
     /// The canonical alias of the room, if any.
     #[serde(skip_serializing_if = "Option::is_none")]
-    pub canonical_alias: Option<RoomAliasId>,
+    pub canonical_alias: Option<Box<RoomAliasId>>,
 
     /// The name of the room, if any.
     #[serde(skip_serializing_if = "Option::is_none")]
diff --git a/crates/ruma-common/src/thirdparty.rs b/crates/ruma-common/src/thirdparty.rs
index d52ed367..c46b7acf 100644
--- a/crates/ruma-common/src/thirdparty.rs
+++ b/crates/ruma-common/src/thirdparty.rs
@@ -173,7 +173,7 @@ impl From<FieldTypeInit> for FieldType {
 #[cfg_attr(not(feature = "unstable-exhaustive-types"), non_exhaustive)]
 pub struct Location {
     /// An alias for a matrix room.
-    pub alias: RoomAliasId,
+    pub alias: Box<RoomAliasId>,
 
     /// The protocol ID that the third party location is a part of.
     pub protocol: String,
@@ -184,7 +184,11 @@ pub struct Location {
 
 impl Location {
     /// Creates a new `Location` with the given alias, protocol and fields.
-    pub fn new(alias: RoomAliasId, protocol: String, fields: BTreeMap<String, String>) -> Self {
+    pub fn new(
+        alias: Box<RoomAliasId>,
+        protocol: String,
+        fields: BTreeMap<String, String>,
+    ) -> Self {
         Self { alias, protocol, fields }
     }
 }
diff --git a/crates/ruma-events/src/room/aliases.rs b/crates/ruma-events/src/room/aliases.rs
index 65b0ca55..ee8307ca 100644
--- a/crates/ruma-events/src/room/aliases.rs
+++ b/crates/ruma-events/src/room/aliases.rs
@@ -18,12 +18,12 @@ use crate::{
 #[ruma_event(type = "m.room.aliases", kind = State, custom_redacted)]
 pub struct RoomAliasesEventContent {
     /// A list of room aliases.
-    pub aliases: Vec<RoomAliasId>,
+    pub aliases: Vec<Box<RoomAliasId>>,
 }
 
 impl RoomAliasesEventContent {
     /// Create an `RoomAliasesEventContent` from the given aliases.
-    pub fn new(aliases: Vec<RoomAliasId>) -> Self {
+    pub fn new(aliases: Vec<Box<RoomAliasId>>) -> Self {
         Self { aliases }
     }
 }
@@ -55,14 +55,14 @@ pub struct RedactedRoomAliasesEventContent {
     ///
     /// According to the Matrix spec version 1 redaction rules allowed this field to be
     /// kept after redaction, this was changed in version 6.
-    pub aliases: Option<Vec<RoomAliasId>>,
+    pub aliases: Option<Vec<Box<RoomAliasId>>>,
 }
 
 impl RedactedRoomAliasesEventContent {
     /// Create a `RedactedAliasesEventContent` with the given aliases.
     ///
     /// This is only valid for room version 5 and below.
-    pub fn new_v1(aliases: Vec<RoomAliasId>) -> Self {
+    pub fn new_v1(aliases: Vec<Box<RoomAliasId>>) -> Self {
         Self { aliases: Some(aliases) }
     }
 
diff --git a/crates/ruma-events/src/room/canonical_alias.rs b/crates/ruma-events/src/room/canonical_alias.rs
index bd6fab04..2ca05894 100644
--- a/crates/ruma-events/src/room/canonical_alias.rs
+++ b/crates/ruma-events/src/room/canonical_alias.rs
@@ -20,11 +20,11 @@ pub struct RoomCanonicalAliasEventContent {
         deserialize_with = "ruma_serde::empty_string_as_none",
         skip_serializing_if = "Option::is_none"
     )]
-    pub alias: Option<RoomAliasId>,
+    pub alias: Option<Box<RoomAliasId>>,
 
     /// List of alternative aliases to the room.
     #[serde(default, skip_serializing_if = "Vec::is_empty")]
-    pub alt_aliases: Vec<RoomAliasId>,
+    pub alt_aliases: Vec<Box<RoomAliasId>>,
 }
 
 impl RoomCanonicalAliasEventContent {
@@ -48,7 +48,7 @@ mod tests {
     fn serialization_with_optional_fields_as_none() {
         let canonical_alias_event = StateEvent {
             content: RoomCanonicalAliasEventContent {
-                alias: Some(room_alias_id!("#somewhere:localhost")),
+                alias: Some(room_alias_id!("#somewhere:localhost").to_owned()),
                 alt_aliases: Vec::new(),
             },
             event_id: event_id!("$h29iv0s8:example.com").to_owned(),
@@ -143,7 +143,7 @@ mod tests {
 
     #[test]
     fn nonempty_field_as_some() {
-        let alias = Some(room_alias_id!("#somewhere:localhost"));
+        let alias = Some(room_alias_id!("#somewhere:localhost").to_owned());
         let json_data = json!({
             "content": {
                 "alias": "#somewhere:localhost"
diff --git a/crates/ruma-events/tests/state_event.rs b/crates/ruma-events/tests/state_event.rs
index 6efea980..e35d608a 100644
--- a/crates/ruma-events/tests/state_event.rs
+++ b/crates/ruma-events/tests/state_event.rs
@@ -36,10 +36,14 @@ fn aliases_event_with_prev_content() -> JsonValue {
 #[test]
 fn serialize_aliases_with_prev_content() {
     let aliases_event = StateEvent {
-        content: RoomAliasesEventContent::new(vec![room_alias_id!("#somewhere:localhost")]),
+        content: RoomAliasesEventContent::new(vec![
+            room_alias_id!("#somewhere:localhost").to_owned()
+        ]),
         event_id: event_id!("$h29iv0s8:example.com").to_owned(),
         origin_server_ts: MilliSecondsSinceUnixEpoch(uint!(1)),
-        prev_content: Some(RoomAliasesEventContent::new(vec![room_alias_id!("#inner:localhost")])),
+        prev_content: Some(RoomAliasesEventContent::new(vec![
+            room_alias_id!("#inner:localhost").to_owned()
+        ])),
         room_id: room_id!("!roomid:room.com"),
         sender: user_id!("@carl:example.com"),
         state_key: "".into(),
@@ -55,7 +59,9 @@ fn serialize_aliases_with_prev_content() {
 #[test]
 fn serialize_aliases_without_prev_content() {
     let aliases_event = StateEvent {
-        content: RoomAliasesEventContent::new(vec![room_alias_id!("#somewhere:localhost")]),
+        content: RoomAliasesEventContent::new(vec![
+            room_alias_id!("#somewhere:localhost").to_owned()
+        ]),
         event_id: event_id!("$h29iv0s8:example.com").to_owned(),
         origin_server_ts: MilliSecondsSinceUnixEpoch(uint!(1)),
         prev_content: None,
diff --git a/crates/ruma-identifiers-macros/src/lib.rs b/crates/ruma-identifiers-macros/src/lib.rs
index 467e9ec3..f34de542 100644
--- a/crates/ruma-identifiers-macros/src/lib.rs
+++ b/crates/ruma-identifiers-macros/src/lib.rs
@@ -55,7 +55,7 @@ pub fn room_alias_id(input: TokenStream) -> TokenStream {
     assert!(room_alias_id::validate(&id.value()).is_ok(), "Invalid room_alias_id");
 
     let output = quote! {
-        <#dollar_crate::RoomAliasId as ::std::convert::TryFrom<&str>>::try_from(#id).unwrap()
+        <&#dollar_crate::RoomAliasId as ::std::convert::TryFrom<&str>>::try_from(#id).unwrap()
     };
 
     output.into()
diff --git a/crates/ruma-identifiers-validation/src/room_alias_id.rs b/crates/ruma-identifiers-validation/src/room_alias_id.rs
index 48ab1220..d1ecfb88 100644
--- a/crates/ruma-identifiers-validation/src/room_alias_id.rs
+++ b/crates/ruma-identifiers-validation/src/room_alias_id.rs
@@ -1,7 +1,5 @@
-use std::num::NonZeroU8;
+use crate::{validate_delimited_id, Error};
 
-use crate::{parse_id, Error};
-
-pub fn validate(s: &str) -> Result<NonZeroU8, Error> {
-    parse_id(s, &['#'])
+pub fn validate(s: &str) -> Result<(), Error> {
+    validate_delimited_id(s, &['#'])
 }
diff --git a/crates/ruma-identifiers/src/room_alias_id.rs b/crates/ruma-identifiers/src/room_alias_id.rs
index 7ecaea10..46a09b6e 100644
--- a/crates/ruma-identifiers/src/room_alias_id.rs
+++ b/crates/ruma-identifiers/src/room_alias_id.rs
@@ -1,6 +1,6 @@
 //! Matrix room alias identifiers.
 
-use std::{convert::TryInto, fmt, num::NonZeroU8};
+use std::convert::TryInto;
 
 use crate::{server_name::ServerName, EventId, MatrixToRef};
 
@@ -13,57 +13,41 @@ use crate::{server_name::ServerName, EventId, MatrixToRef};
 /// # use std::convert::TryFrom;
 /// # use ruma_identifiers::RoomAliasId;
 /// assert_eq!(
-///     RoomAliasId::try_from("#ruma:example.com").unwrap().as_ref(),
+///     <&RoomAliasId>::try_from("#ruma:example.com").unwrap(),
 ///     "#ruma:example.com"
 /// );
 /// ```
-#[derive(Clone)]
-pub struct RoomAliasId {
-    pub(crate) full_id: Box<str>,
-    pub(crate) colon_idx: NonZeroU8,
-}
+#[repr(transparent)]
+pub struct RoomAliasId(str);
 
-impl fmt::Debug for RoomAliasId {
-    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
-        self.full_id.fmt(f)
-    }
-}
+opaque_identifier_validated!(RoomAliasId, ruma_identifiers_validation::room_alias_id::validate);
 
 impl RoomAliasId {
     /// Returns the room's alias.
     pub fn alias(&self) -> &str {
-        &self.full_id[1..self.colon_idx.get() as usize]
+        &self.as_str()[1..self.colon_idx()]
     }
 
     /// Returns the server name of the room alias ID.
     pub fn server_name(&self) -> &ServerName {
-        self.full_id[self.colon_idx.get() as usize + 1..].try_into().unwrap()
+        self.as_str()[self.colon_idx() + 1..].try_into().unwrap()
     }
 
     /// Create a `matrix.to` reference for this room alias ID.
     pub fn matrix_to_url(&self) -> MatrixToRef<'_> {
-        MatrixToRef::new(&self.full_id, Vec::new())
+        MatrixToRef::new(self.as_str(), Vec::new())
     }
 
     /// Create a `matrix.to` reference for an event scoped under this room alias ID.
     pub fn matrix_to_event_url<'a>(&'a self, ev_id: &'a EventId) -> MatrixToRef<'a> {
-        MatrixToRef::event(&self.full_id, ev_id, Vec::new())
+        MatrixToRef::event(self.as_str(), ev_id, Vec::new())
+    }
+
+    fn colon_idx(&self) -> usize {
+        self.as_str().find(':').unwrap()
     }
 }
 
-/// Attempts to create a new Matrix room alias ID from a string representation.
-///
-/// The string must include the leading # sigil, the alias, a literal colon, and a server name.
-fn try_from<S>(room_alias_id: S) -> Result<RoomAliasId, crate::Error>
-where
-    S: AsRef<str> + Into<Box<str>>,
-{
-    let colon_idx = ruma_identifiers_validation::room_alias_id::validate(room_alias_id.as_ref())?;
-    Ok(RoomAliasId { full_id: room_alias_id.into(), colon_idx })
-}
-
-common_impls!(RoomAliasId, try_from, "a Matrix room alias ID");
-
 #[cfg(test)]
 mod tests {
     use std::convert::TryFrom;
@@ -74,9 +58,7 @@ mod tests {
     #[test]
     fn valid_room_alias_id() {
         assert_eq!(
-            RoomAliasId::try_from("#ruma:example.com")
-                .expect("Failed to create RoomAliasId.")
-                .as_ref(),
+            <&RoomAliasId>::try_from("#ruma:example.com").expect("Failed to create RoomAliasId."),
             "#ruma:example.com"
         );
     }
@@ -84,9 +66,7 @@ mod tests {
     #[test]
     fn empty_localpart() {
         assert_eq!(
-            RoomAliasId::try_from("#:myhomeserver.io")
-                .expect("Failed to create RoomAliasId.")
-                .as_ref(),
+            <&RoomAliasId>::try_from("#:myhomeserver.io").expect("Failed to create RoomAliasId."),
             "#:myhomeserver.io"
         );
     }
@@ -96,7 +76,8 @@ mod tests {
     fn serialize_valid_room_alias_id() {
         assert_eq!(
             serde_json::to_string(
-                &RoomAliasId::try_from("#ruma:example.com").expect("Failed to create RoomAliasId.")
+                <&RoomAliasId>::try_from("#ruma:example.com")
+                    .expect("Failed to create RoomAliasId.")
             )
             .expect("Failed to convert RoomAliasId to JSON."),
             r##""#ruma:example.com""##
@@ -107,18 +88,17 @@ mod tests {
     #[test]
     fn deserialize_valid_room_alias_id() {
         assert_eq!(
-            serde_json::from_str::<RoomAliasId>(r##""#ruma:example.com""##)
+            serde_json::from_str::<Box<RoomAliasId>>(r##""#ruma:example.com""##)
                 .expect("Failed to convert JSON to RoomAliasId"),
-            RoomAliasId::try_from("#ruma:example.com").expect("Failed to create RoomAliasId.")
+            <&RoomAliasId>::try_from("#ruma:example.com").expect("Failed to create RoomAliasId.")
         );
     }
 
     #[test]
     fn valid_room_alias_id_with_explicit_standard_port() {
         assert_eq!(
-            RoomAliasId::try_from("#ruma:example.com:443")
-                .expect("Failed to create RoomAliasId.")
-                .as_ref(),
+            <&RoomAliasId>::try_from("#ruma:example.com:443")
+                .expect("Failed to create RoomAliasId."),
             "#ruma:example.com:443"
         );
     }
@@ -126,9 +106,8 @@ mod tests {
     #[test]
     fn valid_room_alias_id_with_non_standard_port() {
         assert_eq!(
-            RoomAliasId::try_from("#ruma:example.com:5000")
-                .expect("Failed to create RoomAliasId.")
-                .as_ref(),
+            <&RoomAliasId>::try_from("#ruma:example.com:5000")
+                .expect("Failed to create RoomAliasId."),
             "#ruma:example.com:5000"
         );
     }
@@ -136,9 +115,8 @@ mod tests {
     #[test]
     fn valid_room_alias_id_unicode() {
         assert_eq!(
-            RoomAliasId::try_from("#老虎£я:example.com")
-                .expect("Failed to create RoomAliasId.")
-                .as_ref(),
+            <&RoomAliasId>::try_from("#老虎£я:example.com")
+                .expect("Failed to create RoomAliasId."),
             "#老虎£я:example.com"
         );
     }
@@ -146,33 +124,33 @@ mod tests {
     #[test]
     fn missing_room_alias_id_sigil() {
         assert_eq!(
-            RoomAliasId::try_from("39hvsi03hlne:example.com").unwrap_err(),
+            <&RoomAliasId>::try_from("39hvsi03hlne:example.com").unwrap_err(),
             Error::MissingLeadingSigil
         );
     }
 
     #[test]
     fn missing_room_alias_id_delimiter() {
-        assert_eq!(RoomAliasId::try_from("#ruma").unwrap_err(), Error::MissingDelimiter);
+        assert_eq!(<&RoomAliasId>::try_from("#ruma").unwrap_err(), Error::MissingDelimiter);
     }
 
     #[test]
     fn invalid_leading_sigil() {
         assert_eq!(
-            RoomAliasId::try_from("!room_id:foo.bar").unwrap_err(),
+            <&RoomAliasId>::try_from("!room_id:foo.bar").unwrap_err(),
             Error::MissingLeadingSigil
         );
     }
 
     #[test]
     fn invalid_room_alias_id_host() {
-        assert_eq!(RoomAliasId::try_from("#ruma:/").unwrap_err(), Error::InvalidServerName);
+        assert_eq!(<&RoomAliasId>::try_from("#ruma:/").unwrap_err(), Error::InvalidServerName);
     }
 
     #[test]
     fn invalid_room_alias_id_port() {
         assert_eq!(
-            RoomAliasId::try_from("#ruma:example.com:notaport").unwrap_err(),
+            <&RoomAliasId>::try_from("#ruma:example.com:notaport").unwrap_err(),
             Error::InvalidServerName
         );
     }
diff --git a/crates/ruma-identifiers/src/room_id_or_room_alias_id.rs b/crates/ruma-identifiers/src/room_id_or_room_alias_id.rs
index 27d7accc..40ed6f55 100644
--- a/crates/ruma-identifiers/src/room_id_or_room_alias_id.rs
+++ b/crates/ruma-identifiers/src/room_id_or_room_alias_id.rs
@@ -63,15 +63,12 @@ impl RoomIdOrAliasId {
 
     /// Turn this `RoomIdOrAliasId` into `Either<RoomId, RoomAliasId>`
     #[cfg(feature = "either")]
-    pub fn into_either(self) -> either::Either<RoomId, RoomAliasId> {
+    pub fn into_either(self) -> either::Either<RoomId, Box<RoomAliasId>> {
         match self.variant() {
             Variant::RoomId => {
                 either::Either::Left(RoomId { full_id: self.full_id, colon_idx: self.colon_idx })
             }
-            Variant::RoomAliasId => either::Either::Right(RoomAliasId {
-                full_id: self.full_id,
-                colon_idx: self.colon_idx,
-            }),
+            Variant::RoomAliasId => either::Either::Right(self.as_str().try_into().unwrap()),
         }
     }
 
@@ -112,33 +109,29 @@ impl From<RoomId> for RoomIdOrAliasId {
     }
 }
 
-impl From<RoomAliasId> for RoomIdOrAliasId {
-    fn from(RoomAliasId { full_id, colon_idx }: RoomAliasId) -> Self {
-        Self { full_id, colon_idx }
+impl From<Box<RoomAliasId>> for RoomIdOrAliasId {
+    fn from(room_alias_id: Box<RoomAliasId>) -> Self {
+        Self::try_from(room_alias_id.as_str()).unwrap()
     }
 }
 
 impl TryFrom<RoomIdOrAliasId> for RoomId {
-    type Error = RoomAliasId;
+    type Error = Box<RoomAliasId>;
 
-    fn try_from(id: RoomIdOrAliasId) -> Result<RoomId, RoomAliasId> {
+    fn try_from(id: RoomIdOrAliasId) -> Result<RoomId, Box<RoomAliasId>> {
         match id.variant() {
             Variant::RoomId => Ok(RoomId { full_id: id.full_id, colon_idx: id.colon_idx }),
-            Variant::RoomAliasId => {
-                Err(RoomAliasId { full_id: id.full_id, colon_idx: id.colon_idx })
-            }
+            Variant::RoomAliasId => Err(id.as_str().try_into().unwrap()),
         }
     }
 }
 
-impl TryFrom<RoomIdOrAliasId> for RoomAliasId {
+impl TryFrom<RoomIdOrAliasId> for Box<RoomAliasId> {
     type Error = RoomId;
 
-    fn try_from(id: RoomIdOrAliasId) -> Result<RoomAliasId, RoomId> {
+    fn try_from(id: RoomIdOrAliasId) -> Result<Box<RoomAliasId>, RoomId> {
         match id.variant() {
-            Variant::RoomAliasId => {
-                Ok(RoomAliasId { full_id: id.full_id, colon_idx: id.colon_idx })
-            }
+            Variant::RoomAliasId => Ok(id.as_str().try_into().unwrap()),
             Variant::RoomId => Err(RoomId { full_id: id.full_id, colon_idx: id.colon_idx }),
         }
     }
diff --git a/crates/ruma-push-gateway-api/src/send_event_notification/v1.rs b/crates/ruma-push-gateway-api/src/send_event_notification/v1.rs
index ade8e49e..50c2866a 100644
--- a/crates/ruma-push-gateway-api/src/send_event_notification/v1.rs
+++ b/crates/ruma-push-gateway-api/src/send_event_notification/v1.rs
@@ -368,7 +368,7 @@ mod tests {
             event_type: Some(&EventType::RoomMessage),
             sender: Some(&uid),
             sender_display_name: Some("Major Tom"),
-            room_alias: Some(&alias),
+            room_alias: Some(alias),
             content: Some(serde_json::from_str("{}").unwrap()),
             counts: count,
             prio: NotificationPriority::Low,
diff --git a/crates/ruma-serde-macros/src/outgoing.rs b/crates/ruma-serde-macros/src/outgoing.rs
index 9ba1117f..835bd141 100644
--- a/crates/ruma-serde-macros/src/outgoing.rs
+++ b/crates/ruma-serde-macros/src/outgoing.rs
@@ -267,6 +267,7 @@ fn strip_lifetimes(field_type: &mut Type) -> bool {
                         || last_seg.ident == "ServerName"
                         || last_seg.ident == "SessionId"
                         || last_seg.ident == "RawJsonValue"
+                        || last_seg.ident == "RoomAliasId"
                         || last_seg.ident == "RoomName"
                     {
                         // The identifiers that need to be boxed `Box<T>` since they are DST's.
diff --git a/crates/ruma/examples/hello_isahc.rs b/crates/ruma/examples/hello_isahc.rs
index ec4fd8f1..16e55db0 100644
--- a/crates/ruma/examples/hello_isahc.rs
+++ b/crates/ruma/examples/hello_isahc.rs
@@ -48,5 +48,6 @@ async fn main() -> anyhow::Result<()> {
             }
         };
 
-    hello_world(homeserver_url, &username, &password, &RoomAliasId::try_from(room.as_str())?).await
+    hello_world(homeserver_url, &username, &password, <&RoomAliasId>::try_from(room.as_str())?)
+        .await
 }
diff --git a/crates/ruma/examples/hello_world.rs b/crates/ruma/examples/hello_world.rs
index e2e40197..8960af8a 100644
--- a/crates/ruma/examples/hello_world.rs
+++ b/crates/ruma/examples/hello_world.rs
@@ -44,5 +44,6 @@ async fn main() -> anyhow::Result<()> {
             }
         };
 
-    hello_world(homeserver_url, &username, &password, &RoomAliasId::try_from(room.as_str())?).await
+    hello_world(homeserver_url, &username, &password, <&RoomAliasId>::try_from(room.as_str())?)
+        .await
 }