diff --git a/aio/tools/ng-packages-installer/index.js b/aio/tools/ng-packages-installer/index.js
index d6c5aca5cb..702dec212c 100644
--- a/aio/tools/ng-packages-installer/index.js
+++ b/aio/tools/ng-packages-installer/index.js
@@ -128,7 +128,7 @@ class NgPackagesInstaller {
    * Yarn will also delete the local marker file for us.
    */
   restoreNpmDependencies() {
-    this._installDeps('--check-files');
+    this._installDeps('--freeze-lockfile', '--check-files');
   }
 
   // Protected helpers
diff --git a/aio/tools/ng-packages-installer/index.spec.js b/aio/tools/ng-packages-installer/index.spec.js
index 55ba1c5384..8d8c430172 100644
--- a/aio/tools/ng-packages-installer/index.spec.js
+++ b/aio/tools/ng-packages-installer/index.spec.js
@@ -194,10 +194,10 @@ describe('NgPackagesInstaller', () => {
   });
 
   describe('restoreNpmDependencies()', () => {
-    it('should run `yarn install --check-files` in the specified directory', () => {
+    it('should run `yarn install` in the specified directory, with the correct options', () => {
       spyOn(installer, '_installDeps');
       installer.restoreNpmDependencies();
-      expect(installer._installDeps).toHaveBeenCalledWith('--check-files');
+      expect(installer._installDeps).toHaveBeenCalledWith('--freeze-lockfile', '--check-files');
     });
   });