diff --git a/aio/package.json b/aio/package.json
index c3254ea710..3bba7ded2d 100644
--- a/aio/package.json
+++ b/aio/package.json
@@ -34,7 +34,7 @@
     "generate-zips": "node ./tools/example-zipper/generateZips",
     "sw-manifest": "ngu-sw-manifest --dist dist --in ngsw-manifest.json --out dist/ngsw-manifest.json",
     "sw-copy": "cp node_modules/@angular/service-worker/bundles/worker-basic.min.js dist/",
-    "postinstall": "node --eval \"const fs=require('fs'), sh=require('shelljs'), PATCH_LOCK='node_modules/@angular/cli/models/webpack-configs/.patched'; if (!fs.existsSync(PATCH_LOCK)) { sh.touch(PATCH_LOCK); sh.exec('patch -p0 -i tools/cli-patches/ngo-loader.patch && patch -p0 -i node_modules/purify/angular-cli.patch && patch -p0 -i tools/cli-patches/uglify-config.patch'); }\"",
+    "postinstall": "node tools/cli-patches/patch.js",
     "build-ie-polyfills": "webpack -p src/ie-polyfills.js src/generated/ie-polyfills.min.js"
   },
   "private": true,
diff --git a/aio/tools/cli-patches/patch.js b/aio/tools/cli-patches/patch.js
new file mode 100644
index 0000000000..1d6cce074a
--- /dev/null
+++ b/aio/tools/cli-patches/patch.js
@@ -0,0 +1,11 @@
+const fs = require('fs');
+const sh = require('shelljs');
+
+PATCH_LOCK = 'node_modules/@angular/cli/models/webpack-configs/.patched';
+
+if (!fs.existsSync(PATCH_LOCK)) {
+  sh.touch(PATCH_LOCK);
+  sh.exec(`patch -p0 -i tools/cli-patches/ngo-loader.patch &&
+           patch -p0 -i node_modules/purify/angular-cli.patch &&
+           patch -p0 -i tools/cli-patches/uglify-config.patch`);
+}