diff --git a/packages/next/build/webpack.js b/packages/next/build/webpack.js
index d5f4ac6e..9eddeb95 100644
--- a/packages/next/build/webpack.js
+++ b/packages/next/build/webpack.js
@@ -206,7 +206,7 @@ export default async function getBaseWebpackConfig (dir, {dev = false, isServer
 
   const resolveConfig = {
     // Disable .mjs for node_modules bundling
-    extensions: ['.wasm', !lambdas && '.mjs', '.js', '.jsx', '.json'].filter(Boolean),
+    extensions: ['.wasm', '.mjs', '.js', '.jsx', '.json'].filter(Boolean),
     modules: [
       NEXT_PROJECT_ROOT_NODE_MODULES,
       'node_modules',