diff --git a/wp-includes/js/tinymce/plugins/wpdialogs/js/wpdialog.js b/wp-includes/js/tinymce/plugins/wpdialogs/js/wpdialog.js
index 6e25a1fa3e..a846fd0d6e 100644
--- a/wp-includes/js/tinymce/plugins/wpdialogs/js/wpdialog.js
+++ b/wp-includes/js/tinymce/plugins/wpdialogs/js/wpdialog.js
@@ -4,6 +4,7 @@
 		options: {
 			closeOnEscape: false
 		},
+		widgetEventPrefix: 'wpdialog',
 
 		open: function() {
 			var ed;