diff --git a/crates/ruma-common/src/events/room/member.rs b/crates/ruma-common/src/events/room/member.rs
index cf883992..38b83c63 100644
--- a/crates/ruma-common/src/events/room/member.rs
+++ b/crates/ruma-common/src/events/room/member.rs
@@ -15,9 +15,13 @@ use crate::{
     },
     serde::StringEnum,
     MxcUri, OwnedServerName, OwnedServerSigningKeyId, OwnedUserId, PrivOwnedStr, RoomVersionId,
-    UserId,
 };
 
+mod change;
+
+use self::change::membership_change;
+pub use self::change::{MembershipChange, MembershipDetails};
+
 /// The content of an `m.room.member` event.
 ///
 /// The current membership state of a user in the room.
@@ -293,101 +297,6 @@ impl SignedContent {
     }
 }
 
-/// The details of a member event required to calculate a [`MembershipChange`].
-pub struct MembershipDetails<'a> {
-    // These fields are intentionally private, this struct is only meant for
-    // passing it to one of the membership_change methods on redacted events.
-    avatar_url: Option<&'a MxcUri>,
-    displayname: Option<&'a str>,
-    membership: &'a MembershipState,
-}
-
-/// Translation of the membership change in `m.room.member` event.
-#[derive(Clone, Debug, Deserialize, Serialize)]
-#[cfg_attr(not(feature = "unstable-exhaustive-types"), non_exhaustive)]
-pub enum MembershipChange {
-    /// No change.
-    None,
-
-    /// Must never happen.
-    Error,
-
-    /// User joined the room.
-    Joined,
-
-    /// User left the room.
-    Left,
-
-    /// User was banned.
-    Banned,
-
-    /// User was unbanned.
-    Unbanned,
-
-    /// User was kicked.
-    Kicked,
-
-    /// User was invited.
-    Invited,
-
-    /// User was kicked and banned.
-    KickedAndBanned,
-
-    /// User rejected the invite.
-    InvitationRejected,
-
-    /// User had their invite revoked.
-    InvitationRevoked,
-
-    /// `displayname` or `avatar_url` changed.
-    ProfileChanged {
-        /// Whether the `displayname` changed.
-        displayname_changed: bool,
-
-        /// Whether the `avatar_url` changed.
-        avatar_url_changed: bool,
-    },
-
-    /// Not implemented.
-    NotImplemented,
-}
-
-/// Internal function so all `RoomMemberEventContent` state event kinds can share the same
-/// implementation.
-fn membership_change(
-    details: MembershipDetails<'_>,
-    prev_details: Option<MembershipDetails<'_>>,
-    sender: &UserId,
-    state_key: &UserId,
-) -> MembershipChange {
-    use MembershipChange as Ch;
-    use MembershipState as St;
-
-    let prev_details = match prev_details {
-        Some(prev) => prev,
-        None => MembershipDetails { avatar_url: None, displayname: None, membership: &St::Leave },
-    };
-
-    match (&prev_details.membership, &details.membership) {
-        (St::Invite, St::Invite) | (St::Leave, St::Leave) | (St::Ban, St::Ban) => Ch::None,
-        (St::Invite, St::Join) | (St::Leave, St::Join) => Ch::Joined,
-        (St::Invite, St::Leave) if sender == state_key => Ch::InvitationRevoked,
-        (St::Invite, St::Leave) => Ch::InvitationRejected,
-        (St::Invite, St::Ban) | (St::Leave, St::Ban) => Ch::Banned,
-        (St::Join, St::Invite) | (St::Ban, St::Invite) | (St::Ban, St::Join) => Ch::Error,
-        (St::Join, St::Join) => Ch::ProfileChanged {
-            displayname_changed: prev_details.displayname != details.displayname,
-            avatar_url_changed: prev_details.avatar_url != details.avatar_url,
-        },
-        (St::Join, St::Leave) if sender == state_key => Ch::Left,
-        (St::Join, St::Leave) => Ch::Kicked,
-        (St::Join, St::Ban) => Ch::KickedAndBanned,
-        (St::Leave, St::Invite) => Ch::Invited,
-        (St::Ban, St::Leave) => Ch::Unbanned,
-        _ => Ch::NotImplemented,
-    }
-}
-
 impl OriginalRoomMemberEvent {
     /// Obtain the details about this event that are required to calculate a membership change.
     ///
diff --git a/crates/ruma-common/src/events/room/member/change.rs b/crates/ruma-common/src/events/room/member/change.rs
new file mode 100644
index 00000000..9d015ea7
--- /dev/null
+++ b/crates/ruma-common/src/events/room/member/change.rs
@@ -0,0 +1,97 @@
+use serde::{Deserialize, Serialize};
+
+use super::MembershipState;
+use crate::{MxcUri, UserId};
+
+/// The details of a member event required to calculate a [`MembershipChange`].
+pub struct MembershipDetails<'a> {
+    pub(crate) avatar_url: Option<&'a MxcUri>,
+    pub(crate) displayname: Option<&'a str>,
+    pub(crate) membership: &'a MembershipState,
+}
+
+/// Translation of the membership change in `m.room.member` event.
+#[derive(Clone, Debug, Deserialize, Serialize)]
+#[cfg_attr(not(feature = "unstable-exhaustive-types"), non_exhaustive)]
+pub enum MembershipChange {
+    /// No change.
+    None,
+
+    /// Must never happen.
+    Error,
+
+    /// User joined the room.
+    Joined,
+
+    /// User left the room.
+    Left,
+
+    /// User was banned.
+    Banned,
+
+    /// User was unbanned.
+    Unbanned,
+
+    /// User was kicked.
+    Kicked,
+
+    /// User was invited.
+    Invited,
+
+    /// User was kicked and banned.
+    KickedAndBanned,
+
+    /// User rejected the invite.
+    InvitationRejected,
+
+    /// User had their invite revoked.
+    InvitationRevoked,
+
+    /// `displayname` or `avatar_url` changed.
+    ProfileChanged {
+        /// Whether the `displayname` changed.
+        displayname_changed: bool,
+
+        /// Whether the `avatar_url` changed.
+        avatar_url_changed: bool,
+    },
+
+    /// Not implemented.
+    NotImplemented,
+}
+
+/// Internal function so all `RoomMemberEventContent` state event kinds can share the same
+/// implementation.
+pub(super) fn membership_change(
+    details: MembershipDetails<'_>,
+    prev_details: Option<MembershipDetails<'_>>,
+    sender: &UserId,
+    state_key: &UserId,
+) -> MembershipChange {
+    use MembershipChange as Ch;
+    use MembershipState as St;
+
+    let prev_details = match prev_details {
+        Some(prev) => prev,
+        None => MembershipDetails { avatar_url: None, displayname: None, membership: &St::Leave },
+    };
+
+    match (&prev_details.membership, &details.membership) {
+        (St::Invite, St::Invite) | (St::Leave, St::Leave) | (St::Ban, St::Ban) => Ch::None,
+        (St::Invite, St::Join) | (St::Leave, St::Join) => Ch::Joined,
+        (St::Invite, St::Leave) if sender == state_key => Ch::InvitationRevoked,
+        (St::Invite, St::Leave) => Ch::InvitationRejected,
+        (St::Invite, St::Ban) | (St::Leave, St::Ban) => Ch::Banned,
+        (St::Join, St::Invite) | (St::Ban, St::Invite) | (St::Ban, St::Join) => Ch::Error,
+        (St::Join, St::Join) => Ch::ProfileChanged {
+            displayname_changed: prev_details.displayname != details.displayname,
+            avatar_url_changed: prev_details.avatar_url != details.avatar_url,
+        },
+        (St::Join, St::Leave) if sender == state_key => Ch::Left,
+        (St::Join, St::Leave) => Ch::Kicked,
+        (St::Join, St::Ban) => Ch::KickedAndBanned,
+        (St::Leave, St::Invite) => Ch::Invited,
+        (St::Ban, St::Leave) => Ch::Unbanned,
+        _ => Ch::NotImplemented,
+    }
+}