1 files changed, 2 insertions, 2 deletions
diff --git a/synapse/storage/state.py b/synapse/storage/state.py
index e790793370..589a4fec6e 100644
--- a/synapse/storage/state.py
+++ b/synapse/storage/state.py
@@ -693,12 +693,12 @@ class StateStore(SQLBaseStore):
                     prev_state = self._get_state_groups_from_groups_txn(
                         txn, [prev_group], types=None
                     )
-                    prev_state = prev_state.values()[0]
+                    prev_state = prev_state[prev_group]
 
                     curr_state = self._get_state_groups_from_groups_txn(
                         txn, [state_group], types=None
                     )
-                    curr_state = curr_state.values()[0]
+                    curr_state = curr_state[state_group]
 
                     if not set(prev_state.keys()) - set(curr_state.keys()):
                         # We can only do a delta if the current has a strict super set