diff --git a/js/models/conversations.js b/js/models/conversations.js
index d52cd8bb8..9acfa9b06 100644
--- a/js/models/conversations.js
+++ b/js/models/conversations.js
@@ -753,7 +753,7 @@
             return {
               contentType,
               fileName: attachment.fileName,
-              thumbnail: makeThumbnail(),
+              thumbnail: await makeThumbnail(),
             };
           })
         ),