diff --git a/app/javascript/mastodon/features/ui/index.js b/app/javascript/mastodon/features/ui/index.js
index f5e48ed31..791ff9a2e 100644
--- a/app/javascript/mastodon/features/ui/index.js
+++ b/app/javascript/mastodon/features/ui/index.js
@@ -327,7 +327,7 @@ class UI extends React.PureComponent {
   }
 
   dataTransferIsText = (dataTransfer) => {
-    return (dataTransfer && Array.from(dataTransfer.types).includes('text/plain') && dataTransfer.items.length === 1);
+    return (dataTransfer && Array.from(dataTransfer.types).filter((type) => type === 'text/plain').length === 1);
   }
 
   closeUploadModal = () => {