diff --git a/packages/gatsby/src/utils/webpack.config.js b/packages/gatsby/src/utils/webpack.config.js
index 5086c1c86f538..6d0fbf89a2809 100644
--- a/packages/gatsby/src/utils/webpack.config.js
+++ b/packages/gatsby/src/utils/webpack.config.js
@@ -107,11 +107,7 @@ module.exports = async (
           // Add /* filename */ comments to generated require()s in the output.
           pathinfo: true,
           // Point sourcemap entries to original disk location (format as URL on Windows)
-          publicPath:
-            process.env.GATSBY_WEBPACK_PUBLICPATH ||
-            `${program.ssl ? `https` : `http`}://${
-              program.host
-            }:${webpackPort}/`,
+          publicPath: process.env.GATSBY_WEBPACK_PUBLICPATH || `/`,
           devtoolModuleFilenameTemplate: info =>
             path.resolve(info.absoluteResourcePath).replace(/\\/g, `/`),
           // Avoid React cross-origin errors