diff --git a/src/components/views/rooms/MessageComposer.js b/src/components/views/rooms/MessageComposer.js
index 78319c7682..20785c4c70 100644
--- a/src/components/views/rooms/MessageComposer.js
+++ b/src/components/views/rooms/MessageComposer.js
@@ -58,7 +58,7 @@ module.exports = React.createClass({
         var fileList = [];
         for(var i=0; i<files.length; i++) {
             fileList.push(<li>
-                <TintableSvg src="img/files.svg" width="16" height="16" /> {files[i].name}
+                <TintableSvg key={i} src="img/files.svg" width="16" height="16" /> {files[i].name}
             </li>);
         }