diff --git a/synapse/push/__init__.py b/synapse/push/__init__.py
index c98aca60b..d69c92911 100644
--- a/synapse/push/__init__.py
+++ b/synapse/push/__init__.py
@@ -32,7 +32,7 @@ class Pusher(object):
     INITIAL_BACKOFF = 1000
     MAX_BACKOFF = 60 * 60 * 1000
     GIVE_UP_AFTER = 24 * 60 * 60 * 1000
-    DEFAULT_ACTIONS = ['dont-notify']
+    DEFAULT_ACTIONS = ['dont_notify']
 
     INEQUALITY_EXPR = re.compile("^([=<>]*)([0-9]*)$")