diff --git a/synapse/push/baserules.py b/synapse/push/baserules.py
index 4d57a89d7eb312d8e8434d19ad820c324414d346..47cf01e3dc3a09ed330bc486e2072dd646f06116 100644
--- a/synapse/push/baserules.py
+++ b/synapse/push/baserules.py
@@ -335,12 +335,14 @@ BASE_APPEND_UNDERRIDE_RULES = [
                 "_id": "_message",
             }
         ],
+        # default to not notifying for group chats
+        # see https://github.com/vector-im/riot-web/issues/3268
+        # we can't do this on existing servers because we need to
+        # add per-user overrides to preserve their existing behaviour
+        "enabled": False,
         "actions": [
-            # default to not notifying for group chats
-            # see https://github.com/vector-im/riot-web/issues/3268
-            # we can't do this on existing servers because we need to
-            # add per-user overrides to preserve their existing behaviour
-            "dont_notify"
+            "notify",
+            {"set_tweak": "highlight", "value": False}
         ],
     },
     # XXX: this is going to fire for events which aren't m.room.messages