diff --git a/ui/js/page/developer.js b/ui/js/page/developer.js
index 31b3b6634..c0d02ef9f 100644
--- a/ui/js/page/developer.js
+++ b/ui/js/page/developer.js
@@ -30,7 +30,7 @@ const DeveloperPage = React.createClass({
   },
   handleUpgradeFileChange: function(event) {
     this.setState({
-      upgradePath: event.target.files[0].path,
+      upgradePath: event.target.value,
     });
   },
   handleForceUpgradeClick: function() {