diff --git a/synapse/handlers/sliding_sync/__init__.py b/synapse/handlers/sliding_sync/__init__.py
index 683281a8a2..17a2f511bd 100644
--- a/synapse/handlers/sliding_sync/__init__.py
+++ b/synapse/handlers/sliding_sync/__init__.py
@@ -333,11 +333,6 @@ async def current_sync_for_user(
             )
         )
 
-        await self.connection_store.mark_token_seen(
-            sync_config=sync_config,
-            from_token=from_token,
-        )
-
         # Get all of the room IDs that the user should be able to see in the sync
         # response
         has_lists = sync_config.lists is not None and len(sync_config.lists) > 0
diff --git a/synapse/handlers/sliding_sync/store.py b/synapse/handlers/sliding_sync/store.py
index 21511ae5b8..5cd2564515 100644
--- a/synapse/handlers/sliding_sync/store.py
+++ b/synapse/handlers/sliding_sync/store.py
@@ -121,11 +121,3 @@ async def record_new_state(
             from_token.connection_position if from_token else None,
             new_connection_state,
         )
-
-    @trace
-    async def mark_token_seen(
-        self,
-        sync_config: SlidingSyncConfig,
-        from_token: Optional[SlidingSyncStreamToken],
-    ) -> None:
-        pass