diff --git a/lib/callout-directive.js b/lib/callout-directive.js
index 824794c..c693abe 100644
--- a/lib/callout-directive.js
+++ b/lib/callout-directive.js
@@ -26,7 +26,7 @@ export default function calloutDirective() {
         attrs.push({
           type: 'mdxJsxAttribute',
           name: 'type',
-          value: { type: 'mdxFlowExpression', value: `"${name}"` },
+          value: name,
         });
 
         // Build children from node's children