diff --git a/packages/gatsby/src/utils/webpack.config.js b/packages/gatsby/src/utils/webpack.config.js
index 08a2536b63d87..2a40d217c6701 100644
--- a/packages/gatsby/src/utils/webpack.config.js
+++ b/packages/gatsby/src/utils/webpack.config.js
@@ -290,7 +290,7 @@ module.exports = async (
               ]
               const isFramework = some(
                 vendorModuleList.map(vendor => {
-                  const regex = new RegExp(`/node_modules/${vendor}/.*`, `i`)
+                  const regex = new RegExp(`[\\\\/]node_modules[\\\\/]${vendor}[\\\\/].*`, `i`)
                   return regex.test(module.resource)
                 })
               )