1 files changed, 1 insertions, 1 deletions
diff --git a/synapse/storage/state.py b/synapse/storage/state.py
index 7f466c40ac..c480743f89 100644
--- a/synapse/storage/state.py
+++ b/synapse/storage/state.py
@@ -284,7 +284,7 @@ class StateStore(SQLBaseStore):
             return [r[0] for r in results]
         return self.runInteraction("get_current_state_for_key", f)
 
-    @cached(num_args=2, max_entries=1000)
+    @cached(num_args=2, max_entries=1000, iterable=True)
     def _get_state_group_from_group(self, group, types):
         raise NotImplementedError()