diff --git a/src/components/views/messages/ReactionsRowButton.js b/src/components/views/messages/ReactionsRowButton.js
index ab1a523cd7..10dea34809 100644
--- a/src/components/views/messages/ReactionsRowButton.js
+++ b/src/components/views/messages/ReactionsRowButton.js
@@ -129,6 +129,7 @@ export default class ReactionsRowButton extends React.PureComponent {
         return <span className={classes}
             role="button"
             aria-label={label}
+            tabindex="0"
             onClick={this.onClick}
             onMouseOver={this.onMouseOver}
             onMouseOut={this.onMouseOut}