diff --git a/dom/workers/test/sharedWorker_sharedWorker.js b/dom/workers/test/sharedWorker_sharedWorker.js
index 5e8e93392b11..22f219026d11 100644
--- a/dom/workers/test/sharedWorker_sharedWorker.js
+++ b/dom/workers/test/sharedWorker_sharedWorker.js
@@ -72,10 +72,9 @@ onconnect = function(event) {
     throw new Error("'connect' event has data: " + event.data);
   }
 
-  // The expression closures should trigger a warning in debug builds, but NOT
-  // fire error events at us. If we ever actually remove expression closures
-  // (in bug 1083458), we'll need something else to test this case.
-  (function() "Expected console warning: expression closures are deprecated");
+  // Statement after return should trigger a warning, but NOT fire error events
+  // at us.
+  (function() { return; 1; });
 
   event.ports[0].onmessage = function(event) {
     if (!(event instanceof MessageEvent)) {
diff --git a/dom/workers/test/test_sharedWorker.html b/dom/workers/test/test_sharedWorker.html
index 3d3d4e2c6c88..0cd0bf80072d 100644
--- a/dom/workers/test/test_sharedWorker.html
+++ b/dom/workers/test/test_sharedWorker.html
@@ -22,7 +22,7 @@
         const sentMessage = "ping";
         const errorFilename = href.substring(0, href.lastIndexOf("/") + 1) +
                               filename;
-        const errorLine = 91;
+        const errorLine = 90;
         const errorColumn = 0;
 
         var worker = new SharedWorker(filename);