diff --git a/src/service/users.rs b/src/service/users.rs
index 9fd40b66..311299ac 100644
--- a/src/service/users.rs
+++ b/src/service/users.rs
@@ -32,15 +32,12 @@ pub(crate) struct SlidingSyncCache {
     extensions: ExtensionsConfig,
 }
 
+type ConnectionKey = (OwnedUserId, OwnedDeviceId, String);
+
 pub(crate) struct Service {
     pub(crate) db: &'static dyn Data,
-    #[expect(clippy::type_complexity)]
-    pub(crate) connections: Mutex<
-        BTreeMap<
-            (OwnedUserId, OwnedDeviceId, String),
-            Arc<Mutex<SlidingSyncCache>>,
-        >,
-    >,
+    pub(crate) connections:
+        Mutex<BTreeMap<ConnectionKey, Arc<Mutex<SlidingSyncCache>>>>,
 }
 
 impl Service {