diff --git a/crates/ruma-common/src/directory.rs b/crates/ruma-common/src/directory.rs
index 1708c3b4..5f469dd1 100644
--- a/crates/ruma-common/src/directory.rs
+++ b/crates/ruma-common/src/directory.rs
@@ -1,18 +1,13 @@
 //! Common types for room directory endpoints.
 
-use std::fmt;
-
 use crate::{
     serde::{Incoming, StringEnum},
     OwnedRoomAliasId, OwnedRoomId,
 };
 use js_int::UInt;
-use serde::{
-    de::{Error, MapAccess, Visitor},
-    ser::SerializeStruct,
-    Deserialize, Deserializer, Serialize, Serializer,
-};
-use serde_json::Value as JsonValue;
+use serde::{Deserialize, Serialize};
+
+mod room_network_serde;
 
 use crate::{OwnedMxcUri, PrivOwnedStr};
 
@@ -154,84 +149,6 @@ impl<'a> Default for RoomNetwork<'a> {
     }
 }
 
-impl<'a> Serialize for RoomNetwork<'a> {
-    fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
-    where
-        S: Serializer,
-    {
-        let mut state;
-        match self {
-            Self::Matrix => {
-                state = serializer.serialize_struct("RoomNetwork", 0)?;
-            }
-            Self::All => {
-                state = serializer.serialize_struct("RoomNetwork", 1)?;
-                state.serialize_field("include_all_networks", &true)?;
-            }
-            Self::ThirdParty(network) => {
-                state = serializer.serialize_struct("RoomNetwork", 1)?;
-                state.serialize_field("third_party_instance_id", network)?;
-            }
-        }
-        state.end()
-    }
-}
-
-impl<'de> Deserialize<'de> for IncomingRoomNetwork {
-    fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
-    where
-        D: Deserializer<'de>,
-    {
-        deserializer.deserialize_map(RoomNetworkVisitor)
-    }
-}
-
-struct RoomNetworkVisitor;
-impl<'de> Visitor<'de> for RoomNetworkVisitor {
-    type Value = IncomingRoomNetwork;
-
-    fn expecting(&self, formatter: &mut fmt::Formatter<'_>) -> fmt::Result {
-        formatter.write_str("Network selection")
-    }
-
-    fn visit_map<M>(self, mut access: M) -> Result<Self::Value, M::Error>
-    where
-        M: MapAccess<'de>,
-    {
-        let mut include_all_networks = false;
-        let mut third_party_instance_id = None;
-        while let Some((key, value)) = access.next_entry::<String, JsonValue>()? {
-            match key.as_str() {
-                "include_all_networks" => {
-                    include_all_networks = match value.as_bool() {
-                        Some(b) => b,
-                        _ => false,
-                    }
-                }
-                "third_party_instance_id" => {
-                    third_party_instance_id = value.as_str().map(|v| v.to_owned());
-                }
-                _ => {}
-            };
-        }
-
-        if include_all_networks {
-            if third_party_instance_id.is_none() {
-                Ok(IncomingRoomNetwork::All)
-            } else {
-                Err(M::Error::custom(
-                    "`include_all_networks = true` and `third_party_instance_id` are mutually exclusive.",
-                ))
-            }
-        } else {
-            Ok(match third_party_instance_id {
-                Some(network) => IncomingRoomNetwork::ThirdParty(network),
-                None => IncomingRoomNetwork::Matrix,
-            })
-        }
-    }
-}
-
 /// The rule used for users wishing to join a public room.
 #[doc = include_str!(concat!(env!("CARGO_MANIFEST_DIR"), "/src/doc/string_enum.md"))]
 #[derive(Clone, Debug, PartialEq, Eq, StringEnum)]
diff --git a/crates/ruma-common/src/directory/room_network_serde.rs b/crates/ruma-common/src/directory/room_network_serde.rs
new file mode 100644
index 00000000..a1b2e643
--- /dev/null
+++ b/crates/ruma-common/src/directory/room_network_serde.rs
@@ -0,0 +1,88 @@
+use std::fmt;
+
+use serde::{
+    de::{Error, MapAccess, Visitor},
+    ser::SerializeStruct,
+    Deserialize, Deserializer, Serialize, Serializer,
+};
+use serde_json::Value as JsonValue;
+
+use super::{IncomingRoomNetwork, RoomNetwork};
+
+impl<'a> Serialize for RoomNetwork<'a> {
+    fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
+    where
+        S: Serializer,
+    {
+        let mut state;
+        match self {
+            Self::Matrix => {
+                state = serializer.serialize_struct("RoomNetwork", 0)?;
+            }
+            Self::All => {
+                state = serializer.serialize_struct("RoomNetwork", 1)?;
+                state.serialize_field("include_all_networks", &true)?;
+            }
+            Self::ThirdParty(network) => {
+                state = serializer.serialize_struct("RoomNetwork", 1)?;
+                state.serialize_field("third_party_instance_id", network)?;
+            }
+        }
+        state.end()
+    }
+}
+
+impl<'de> Deserialize<'de> for IncomingRoomNetwork {
+    fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
+    where
+        D: Deserializer<'de>,
+    {
+        deserializer.deserialize_map(RoomNetworkVisitor)
+    }
+}
+
+struct RoomNetworkVisitor;
+impl<'de> Visitor<'de> for RoomNetworkVisitor {
+    type Value = IncomingRoomNetwork;
+
+    fn expecting(&self, formatter: &mut fmt::Formatter<'_>) -> fmt::Result {
+        formatter.write_str("Network selection")
+    }
+
+    fn visit_map<M>(self, mut access: M) -> Result<Self::Value, M::Error>
+    where
+        M: MapAccess<'de>,
+    {
+        let mut include_all_networks = false;
+        let mut third_party_instance_id = None;
+        while let Some((key, value)) = access.next_entry::<String, JsonValue>()? {
+            match key.as_str() {
+                "include_all_networks" => {
+                    include_all_networks = match value.as_bool() {
+                        Some(b) => b,
+                        _ => false,
+                    }
+                }
+                "third_party_instance_id" => {
+                    third_party_instance_id = value.as_str().map(|v| v.to_owned());
+                }
+                _ => {}
+            };
+        }
+
+        if include_all_networks {
+            if third_party_instance_id.is_none() {
+                Ok(IncomingRoomNetwork::All)
+            } else {
+                Err(M::Error::custom(
+                    "`include_all_networks = true` and `third_party_instance_id` are mutually exclusive.",
+                ))
+            }
+        } else {
+            Ok(match third_party_instance_id {
+                Some(network) => IncomingRoomNetwork::ThirdParty(network),
+                None => IncomingRoomNetwork::Matrix,
+            })
+        }
+    }
+}