diff --git a/packages/gatsby-plugin-no-sourcemaps/gatsby-node.js b/packages/gatsby-plugin-no-sourcemaps/gatsby-node.js
index a2246c1604739..dfb04fae54d99 100644
--- a/packages/gatsby-plugin-no-sourcemaps/gatsby-node.js
+++ b/packages/gatsby-plugin-no-sourcemaps/gatsby-node.js
@@ -1,7 +1,7 @@
 exports.onCreateWebpackConfig = ({ stage, actions }) => {
   if (stage === `build-javascript`) {
     actions.setWebpackConfig({
-      devtool: false,
-    })
+      devtool: process.env.NODE_ENV === 'development' ? 'source-map' : false,
+    });
   }
 }