diff --git a/client/src/components/Upload/UploadBoxMixin.js b/client/src/components/Upload/UploadBoxMixin.js
index 09b2eb981e9..8904c84b29b 100644
--- a/client/src/components/Upload/UploadBoxMixin.js
+++ b/client/src/components/Upload/UploadBoxMixin.js
@@ -259,7 +259,7 @@ export default {
             return $(this.$refs.uploadTable);
         },
         extensionDetails(extension) {
-            return findExtension(this.effectiveExtensions, extension);
+            return findExtension(this.app.effectiveExtensions, extension);
         },
         initExtensionInfo() {
             $(this.$refs.footerExtensionInfo)