diff --git a/ui/dialog.js b/ui/dialog.js
index e5c0bfe21..d10b83657 100644
--- a/ui/dialog.js
+++ b/ui/dialog.js
@@ -150,6 +150,7 @@ return $.widget( "ui.dialog", {
 		var next,
 			originalPosition = this.originalPosition;
 
+		this._untrackInstance();
 		this._destroyOverlay();
 
 		this.element