diff --git a/assets/js/src/form_editor/components/header.jsx b/assets/js/src/form_editor/components/header.jsx
index e80be18516..e06f1daca3 100644
--- a/assets/js/src/form_editor/components/header.jsx
+++ b/assets/js/src/form_editor/components/header.jsx
@@ -27,6 +27,7 @@ export default () => {
           isLarge
           onClick={showPreview}
           isPressed={isPreview}
+          className="editor-post-preview"
         >
           {__('Preview')}
         </Button>