diff --git a/synapse/push/push_rule_evaluator.py b/synapse/push/push_rule_evaluator.py
index 5a34d60abb..b78f2d90d7 100644
--- a/synapse/push/push_rule_evaluator.py
+++ b/synapse/push/push_rule_evaluator.py
@@ -201,6 +201,7 @@ def _glob_to_re(glob, word_boundary):
         r = "^" + re.escape(glob) + "$"
         return re.compile(r, flags=re.IGNORECASE)
 
+
 def _re_word_boundary(r):
     """
     Adds word boundary characters to the start and end of an