diff --git a/packages/gatsby-plugin-mdx/src/gatsby-layout-loader.ts b/packages/gatsby-plugin-mdx/src/gatsby-layout-loader.ts
index 450404cfcc5bf..cdf834ba7af02 100644
--- a/packages/gatsby-plugin-mdx/src/gatsby-layout-loader.ts
+++ b/packages/gatsby-plugin-mdx/src/gatsby-layout-loader.ts
@@ -72,11 +72,6 @@ const gatsbyLayoutLoader: LoaderDefinition = async function () {
     type: `mdxjsEsm` as `text`,
     value: `export * from "${layoutPath}"`,
   })
-
-  tree.children.push({
-    type: `mdxjsEsm` as `text`,
-    value: `export default GatsbyMDXLayout`,
-  })
   const out = toMarkdown(tree, {
     extensions: [mdxToMarkdown() as Options],
   })