diff --git a/synapse/app/pusher.py b/synapse/app/pusher.py
index 89c8d5c7c..9fec6869f 100644
--- a/synapse/app/pusher.py
+++ b/synapse/app/pusher.py
@@ -123,6 +123,10 @@ class PusherSlaveStore(
         DataStore.get_time_of_last_push_action_before.__func__
     )
 
+    get_profile_displayname = (
+        DataStore.get_profile_displayname.__func__
+    )
+
 
 class PusherServer(HomeServer):