diff --git a/lib/content/mixin.js b/lib/content/mixin.js
index ef803e19e..5fc3da332 100644
--- a/lib/content/mixin.js
+++ b/lib/content/mixin.js
@@ -45,9 +45,6 @@ const fileFieldMap = {
   thumbnail: {
     type: Boolean,
   },
-  download_url: {
-    type: String,
-  },
 };
 
 function fileValidator(file) {