diff --git a/test/matrix-to-test.js b/test/matrix-to-test.js
index 33947703ef..23434a57e2 100644
--- a/test/matrix-to-test.js
+++ b/test/matrix-to-test.js
@@ -57,6 +57,8 @@ function mockRoom(roomId, members, serverACL) {
                 }
             },
         },
+        on: () => undefined,
+        removeListener: () => undefined,
     };
 }