diff --git a/browser/base/content/test/browser_pluginnotification.js b/browser/base/content/test/browser_pluginnotification.js
index 759475c6928..1b4fc86cc4b 100644
--- a/browser/base/content/test/browser_pluginnotification.js
+++ b/browser/base/content/test/browser_pluginnotification.js
@@ -72,7 +72,7 @@ function test() {
   gBrowser.selectedTab = newTab;
   gTestBrowser = gBrowser.selectedBrowser;
   gTestBrowser.addEventListener("load", pageLoad, true);
-  prepareTest(test1, gTestRoot + "plugin_unknown.html");
+  prepareTest(runAfterPluginBindingAttached(test1), gTestRoot + "plugin_unknown.html");
 }
 
 function finishTest() {