diff --git a/packages/angular_devkit/build_angular/src/webpack/utils/helpers.ts b/packages/angular_devkit/build_angular/src/webpack/utils/helpers.ts
index fdd2b66de90f..83d202cb4317 100644
--- a/packages/angular_devkit/build_angular/src/webpack/utils/helpers.ts
+++ b/packages/angular_devkit/build_angular/src/webpack/utils/helpers.ts
@@ -102,7 +102,7 @@ export function getWatchOptions(
 ): NonNullable<Configuration['watchOptions']> {
   return {
     poll,
-    ignored: poll === undefined ? '**/$_lazy_route_resources' : 'node_modules/**',
+    ignored: poll === undefined ? '**/$_lazy_route_resources' : '**/node_modules/**',
   };
 }