diff --git a/packages/styleguide/src/components/MDX/MDX.js b/packages/styleguide/src/components/MDX/MDX.js
index 081204f20d9..c49fc4463ef 100644
--- a/packages/styleguide/src/components/MDX/MDX.js
+++ b/packages/styleguide/src/components/MDX/MDX.js
@@ -36,7 +36,10 @@ export const MDXComponents = {
   a: props => <Link {...props} />,
   inlineCode: props => <Code {...props} />,
   code: props => (
-    <CodeBlock language={props.className.replace(/language-/, '')} {...props} />
+    <CodeBlock
+      language={props.className && props.className.replace(/language-/, '')}
+      {...props}
+    />
   ),
 };