diff --git a/dom/base/test/test_navigator_language.html b/dom/base/test/test_navigator_language.html
index f468cb1b1c60..c569e458c1ac 100644
--- a/dom/base/test/test_navigator_language.html
+++ b/dom/base/test/test_navigator_language.html
@@ -60,6 +60,7 @@ https://bugzilla.mozilla.org/show_bug.cgi?id=889335
     if (currentTestIdx >= tests.length) {
       tearDown();
       SimpleTest.finish();
+      return;
     }
 
     tests[currentTestIdx]();