diff --git a/calendar/test/modules/ItemEditingHelpers.jsm b/calendar/test/modules/ItemEditingHelpers.jsm
index 8105c92f05..6d74db6067 100755
--- a/calendar/test/modules/ItemEditingHelpers.jsm
+++ b/calendar/test/modules/ItemEditingHelpers.jsm
@@ -476,6 +476,7 @@ function setCategories(dialog, iframe, categories) {
   }
   categoryList.getNode().hidePopup();
   dialog.click(iframeid("item-title"));
+  dialog.sleep();
 }
 
 /**