diff --git a/synapse/handlers/sync.py b/synapse/handlers/sync.py
index 5428864bb7..3bc18b4338 100644
--- a/synapse/handlers/sync.py
+++ b/synapse/handlers/sync.py
@@ -660,7 +660,7 @@ class SyncHandler(BaseHandler):
             ),
         )
 
-        logging.debug("Room sync: %r", room_sync)
+        logger.debug("Room sync: %r", room_sync)
 
         defer.returnValue(room_sync)
 
@@ -709,7 +709,7 @@ class SyncHandler(BaseHandler):
             ),
         )
 
-        logging.debug("Room sync: %r", room_sync)
+        logger.debug("Room sync: %r", room_sync)
 
         defer.returnValue(room_sync)