diff --git a/ui/dialog.js b/ui/dialog.js
index a86f654d2..8381443ae 100644
--- a/ui/dialog.js
+++ b/ui/dialog.js
@@ -155,6 +155,7 @@ return $.widget( "ui.dialog", {
 		var next,
 			originalPosition = this.originalPosition;
 
+		this._untrackInstance();
 		this._destroyOverlay();
 
 		this.element