diff --git a/synapse/push/__init__.py b/synapse/push/__init__.py
index 8e11abfa5c..7a41c5ece3 100644
--- a/synapse/push/__init__.py
+++ b/synapse/push/__init__.py
@@ -147,7 +147,7 @@ class Pusher(object):
                 logger.warn("event_match condition with no pattern")
                 return False
             # XXX: optimisation: cache our pattern regexps
-            r = r'\b%s\b' % _glob_to_regexp(condition['pattern'])
+            r = r'\b%s\b' % self._glob_to_regexp(condition['pattern'])
             val = _value_for_dotted_key(condition['key'], ev)
             if val is None:
                 return False