diff --git a/packages/next/taskfile-webpack.js b/packages/next/taskfile-webpack.js
index ea2d9a52f7e28..d018bfdd1df9b 100644
--- a/packages/next/taskfile-webpack.js
+++ b/packages/next/taskfile-webpack.js
@@ -26,6 +26,13 @@ module.exports = function (task) {
           })
         }
 
+        if (stats.hasWarnings()) {
+          this.emit('plugin_warning', {
+            plugin: 'taskfile-webpack',
+            warning: `webpack compiled ${options.name} with warnings:\n${stats.toString('errors-warnings')}`,
+          })
+        }
+
         if (process.env.ANALYZE_STATS) {
           require('fs').writeFileSync(
             require('path').join(__dirname, options.name + '-stats.json'),
diff --git a/packages/next/taskfile.js b/packages/next/taskfile.js
index f0e3cae30b9cf..bb42c5c5cd8a9 100644
--- a/packages/next/taskfile.js
+++ b/packages/next/taskfile.js
@@ -2120,7 +2120,12 @@ export async function ncc_ws(task, opts) {
 externals['path-to-regexp'] = 'next/dist/compiled/path-to-regexp'
 export async function path_to_regexp(task, opts) {
   await task
-    .source(relative(__dirname, require.resolve('path-to-regexp')))
+    .source(
+      join(
+        dirname(relative(__dirname, require.resolve('path-to-regexp'))),
+        '*.{js,map}'
+      )
+    )
     .target('dist/compiled/path-to-regexp')
 }