diff --git a/ui/widgets/sortable.js b/ui/widgets/sortable.js
index 8920ed9674d..e941d709eac 100644
--- a/ui/widgets/sortable.js
+++ b/ui/widgets/sortable.js
@@ -82,7 +82,7 @@ return $.widget( "ui.sortable", $.ui.mouse, {
 	},
 
 	_isFloating: function( item ) {
-		return ( /left|right/ ).test( item.css( "float" ) ) || ( /inline|table-cell/ ).test( item.css( "display" ) );
+		return ( /left|right/ ).test( item.css( "float" ) ) || ( /inline|table-cell/ ).test( item.css( "display" ) ) || ( /flex/ ).test( this.element.css( "display" ) );
 	},
 
 	_create: function() {