1 files changed, 1 insertions, 1 deletions
diff --git a/synapse/state.py b/synapse/state.py
index 99f873b6e5..580053d3ff 100644
--- a/synapse/state.py
+++ b/synapse/state.py
@@ -79,7 +79,7 @@ class StateHandler(object):
             defer.returnValue(False)
             return
 
-        if hasattr(event, "outlier") and event.outlier:
+        if event.is_outlier():
             event.state_group = None
             event.old_state_events = None
             event.state_events = None