diff --git a/ui/jquery.ui.draggable.js b/ui/jquery.ui.draggable.js
index 8226c0bcd..a6276c37f 100644
--- a/ui/jquery.ui.draggable.js
+++ b/ui/jquery.ui.draggable.js
@@ -361,7 +361,6 @@ $.widget( "ui.draggable", $.ui.interaction, {
 	},
 
 	_blockFrames: function() {
-		var body = this.document[0].body;
 
 		this.iframeBlocks = this.document.find( "iframe" ).map(function() {
 			var iframe = $( this ),
@@ -375,7 +374,7 @@ $.widget( "ui.draggable", $.ui.interaction, {
 					top: iframeOffset.top,
 					left: iframeOffset.left
 				})
-				.appendTo( body )[0];
+				.appendTo( iframe.parent() )[0];
 		});
 	},