--- a/dom/push/test/xpcshell/test_broadcast_success.js
+++ b/dom/push/test/xpcshell/test_broadcast_success.js
@@ -258,10 +258,10 @@ add_task(async function test_broadcast_i
 
 add_task(async function test_broadcast_reject_invalid_sourceinfo() {
   const path = FileTestUtils.getTempFile("broadcast-listeners.json").path;
   const broadcastService = new BroadcastService(getPushServiceMock(), path);
 
   await assert.rejects(broadcastService.addListener("ghi", "2018-05-06", {
       moduleName: "resource://gre/modules/ghi.jsm",
       symbolName: "getGhi"
-  }), "missing moduleURI", "rejects sourceInfo that doesn't have moduleURI");
+  }), /moduleURI must be a string/, "rejects sourceInfo that doesn't have moduleURI");
 });