diff --git a/application/palemoon/base/content/aboutDialog.xul b/application/palemoon/base/content/aboutDialog.xul
index a34923a0a9..6edfc21555 100644
--- a/application/palemoon/base/content/aboutDialog.xul
+++ b/application/palemoon/base/content/aboutDialog.xul
@@ -24,9 +24,6 @@
         id="PMaboutDialog"
         windowtype="Browser:About"
         onload="init(event);"
-#ifdef MOZ_UPDATER
-        onunload="onUnload(event);"
-#endif
 #ifdef XP_MACOSX
         inwindowmenu="false"
 #else