diff --git a/ui/jquery.ui.mouse.js b/ui/jquery.ui.mouse.js
index 3e6ead8cd76..342b5247679 100644
--- a/ui/jquery.ui.mouse.js
+++ b/ui/jquery.ui.mouse.js
@@ -59,7 +59,7 @@ $.widget("ui.mouse", {
 
 		var self = this,
 			btnIsLeft = (event.which == 1),
-			elIsCancel = (typeof this.options.cancel == "string" ? $(event.target).closest(this.options.cancel).length : false);
+			elIsCancel = (typeof this.options.cancel == "string" ? $(event.target).parents().length && $(event.target).closest(this.options.cancel).length : false);
 		if (!btnIsLeft || elIsCancel || !this._mouseCapture(event)) {
 			return true;
 		}