diff --git a/synapse/push/baserules.py b/synapse/push/baserules.py
index 2bf4b172244a..b61831d604e8 100644
--- a/synapse/push/baserules.py
+++ b/synapse/push/baserules.py
@@ -198,7 +198,7 @@ def make_base_prepend_rules(
             {  # with the will_auto_accept field
                 "kind": "event_match",
                 "key": "content.fi.mau.will_auto_accept",
-                "pattern": "*",
+                "pattern": "true",
                 "_id": "_will_auto_accept",
             },
         ],