1 files changed, 1 insertions, 1 deletions
diff --git a/synapse/storage/data_stores/main/state.py b/synapse/storage/data_stores/main/state.py
index 3132848034..9e1541988e 100644
--- a/synapse/storage/data_stores/main/state.py
+++ b/synapse/storage/data_stores/main/state.py
@@ -1231,7 +1231,7 @@ class StateStore(StateGroupWorkerStore, StateBackgroundUpdateStore):
             # if the event was rejected, just give it the same state as its
             # predecessor.
             if context.rejected:
-                state_groups[event.event_id] = context.prev_group
+                state_groups[event.event_id] = context.state_group_before_event
                 continue
 
             state_groups[event.event_id] = context.state_group