diff --git a/app/javascript/mastodon/features/video/index.js b/app/javascript/mastodon/features/video/index.js
index d8a6c4f50..70e3cd6e8 100644
--- a/app/javascript/mastodon/features/video/index.js
+++ b/app/javascript/mastodon/features/video/index.js
@@ -125,7 +125,7 @@ class Video extends React.PureComponent {
   };
 
   static defaultProps = {
-    frameRate: 25,
+    frameRate: '25',
   };
 
   state = {