diff --git a/app/assets/javascripts/components/features/ui/index.jsx b/app/assets/javascripts/components/features/ui/index.jsx
index 89fb82568..5c7cc6ef4 100644
--- a/app/assets/javascripts/components/features/ui/index.jsx
+++ b/app/assets/javascripts/components/features/ui/index.jsx
@@ -47,7 +47,7 @@ const UI = React.createClass({
       this.dragTargets.push(e.target);
     }
 
-    if (e.dataTransfer && e.dataTransfer.files.length > 0) {
+    if (e.dataTransfer && e.dataTransfer.items.length > 0) {
       this.setState({ draggingOver: true });
     }
   },