diff --git a/platform/ui/src/components/Button/Button.jsx b/platform/ui/src/components/Button/Button.jsx
index 6a68bc765..369246051 100644
--- a/platform/ui/src/components/Button/Button.jsx
+++ b/platform/ui/src/components/Button/Button.jsx
@@ -101,7 +101,7 @@ Button.propTypes = {
   type: PropTypes.string,
   startIcon: PropTypes.node,
   endIcon: PropTypes.node,
-  className: PropTypes.node,
+  className: PropTypes.string,
 };
 
 export default Button;