diff --git a/app/javascript/mastodon/components/alt_text_badge.tsx b/app/javascript/mastodon/components/alt_text_badge.tsx
index 99bec1ee51c..73d5789699d 100644
--- a/app/javascript/mastodon/components/alt_text_badge.tsx
+++ b/app/javascript/mastodon/components/alt_text_badge.tsx
@@ -28,6 +28,7 @@ export const AltTextBadge: React.FC<{
   return (
     <>
       <button
+        type='button'
         ref={anchorRef}
         className='media-gallery__alt__label'
         onClick={handleClick}