diff --git a/aio/tools/ng-packages-installer/index.js b/aio/tools/ng-packages-installer/index.js
index 38e8c8460d..a520cb3843 100644
--- a/aio/tools/ng-packages-installer/index.js
+++ b/aio/tools/ng-packages-installer/index.js
@@ -96,7 +96,7 @@ 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 fa2e14b9e1..48efc0b193 100644
--- a/aio/tools/ng-packages-installer/index.spec.js
+++ b/aio/tools/ng-packages-installer/index.spec.js
@@ -144,10 +144,10 @@ 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');
     });
   });