diff --git a/src/octoprint/static/js/app/client/base.js b/src/octoprint/static/js/app/client/base.js
index c0ea5292..dccfa67f 100644
--- a/src/octoprint/static/js/app/client/base.js
+++ b/src/octoprint/static/js/app/client/base.js
@@ -168,6 +168,7 @@
         }
 
         filename = filename || fileData.name;
+        var filesize = fileData.size;
 
         var form = new FormData();
         form.append("file", fileData, filename);