1 files changed, 4 insertions, 3 deletions
diff --git a/synapse/storage/databases/main/group_server.py b/synapse/storage/databases/main/group_server.py
index 380db3a3f3..0e3b8739c6 100644
--- a/synapse/storage/databases/main/group_server.py
+++ b/synapse/storage/databases/main/group_server.py
@@ -341,14 +341,15 @@ class GroupServerWorkerStore(SQLBaseStore):
             "get_users_for_summary_by_role", _get_users_for_summary_txn
         )
 
-    def is_user_in_group(self, user_id, group_id):
-        return self.db_pool.simple_select_one_onecol(
+    async def is_user_in_group(self, user_id: str, group_id: str) -> bool:
+        result = await self.db_pool.simple_select_one_onecol(
             table="group_users",
             keyvalues={"group_id": group_id, "user_id": user_id},
             retcol="user_id",
             allow_none=True,
             desc="is_user_in_group",
-        ).addCallback(lambda r: bool(r))
+        )
+        return bool(result)
 
     def is_user_admin_in_group(self, group_id, user_id):
         return self.db_pool.simple_select_one_onecol(