diff --git a/dom/promise/tests/test_promise.html b/dom/promise/tests/test_promise.html
index 8ca17fbe76df..56e579a63a24 100644
--- a/dom/promise/tests/test_promise.html
+++ b/dom/promise/tests/test_promise.html
@@ -636,11 +636,14 @@ function promiseResolveThenableCleanStack() {
   // check what happens after all "next cycle" steps
   // have had a chance to complete
   setTimeout(function(){
-    results.push(x);
     // Result should be [0, 2] since `thenable` will be called async.
     is(results[0], 0, "Expected thenable to be called asynchronously");
-    is(results[1], 2, "Expected thenable to be called asynchronously");
-    runTest();
+    // See Bug 1023547 comment 13 for why this check has to be gated on p.
+    p.then(function() {
+      results.push(x);
+      is(results[1], 2, "Expected thenable to be called asynchronously");
+      runTest();
+    });
   },1000);
 }
 
diff --git a/dom/workers/test/promise_worker.js b/dom/workers/test/promise_worker.js
index d3d1fef17896..97275995fef0 100644
--- a/dom/workers/test/promise_worker.js
+++ b/dom/workers/test/promise_worker.js
@@ -672,11 +672,11 @@ function promiseResolveThenableCleanStack() {
   // check what happens after all "next cycle" steps
   // have had a chance to complete
   setTimeout(function(){
-    results.push(x);
     // Result should be [0, 2] since `thenable` will be called async.
     is(results[0], 0, "Expected thenable to be called asynchronously");
     // See Bug 1023547 comment 13 for why this check has to be gated on p.
     p.then(function() {
+      results.push(x);
       is(results[1], 2, "Expected thenable to be called asynchronously");
       runTest();
     });