diff --git a/lib/csf-tools/index.cjs b/lib/csf-tools/index.cjs
index cf2e71760c1..82deacac930 100644
--- a/lib/csf-tools/index.cjs
+++ b/lib/csf-tools/index.cjs
@@ -6,7 +6,7 @@ const lib = require('./dist/cjs/index');
 const readCsfOrMdx = async (fileName, options) => {
   let code = (await fs.readFile(fileName, 'utf-8')).toString();
   if (fileName.endsWith('.mdx')) {
-    const { compile } = global.FEATURES?.previewMdx2
+    const { compile } = global.FEATURES && global.FEATURES.previewMdx2
       ? await import('@storybook/mdx2-csf')
       : await import('@storybook/mdx1-csf');
     code = await compile(code);