diff --git a/aio/tools/ng-packages-installer/index.js b/aio/tools/ng-packages-installer/index.js
index 3dd30a516c..25b67ff9d3 100644
--- a/aio/tools/ng-packages-installer/index.js
+++ b/aio/tools/ng-packages-installer/index.js
@@ -107,7 +107,7 @@ class NgPackagesInstaller {
         try {
           this._log(`Writing temporary local ${PACKAGE_JSON} to ${pathToPackageConfig}`);
           fs.writeFileSync(pathToPackageConfig, localPackageConfigJson);
-          this._installDeps('--no-lockfile', '--check-files');
+          this._installDeps('--pure-lockfile', '--check-files');
           this._setLocalMarker(localPackageConfigJson);
         } finally {
           this._log(`Restoring original ${PACKAGE_JSON} to ${pathToPackageConfig}`);
diff --git a/aio/tools/ng-packages-installer/index.spec.js b/aio/tools/ng-packages-installer/index.spec.js
index b532a05e20..1a0bb8ad5d 100644
--- a/aio/tools/ng-packages-installer/index.spec.js
+++ b/aio/tools/ng-packages-installer/index.spec.js
@@ -145,7 +145,7 @@ describe('NgPackagesInstaller', () => {
       beforeEach(() => {
         log = [];
         fs.writeFileSync.and.callFake((filePath, contents) => filePath === packageJsonPath && log.push(`writeFile: ${contents}`));
-        installer._installDeps.and.callFake(() => log.push('installDeps:'));
+        installer._installDeps.and.callFake((...args) => log.push(`installDeps: ${args.join(' ')}`));
         installer._checkLocalMarker.and.returnValue(false);
         installer.installLocalDependencies();
       });
@@ -198,7 +198,7 @@ describe('NgPackagesInstaller', () => {
       it('should overwrite package.json, then install deps, then restore original package.json', () => {
         expect(log).toEqual([
           `writeFile: ${expectedModifiedPackageJson}`,
-          `installDeps:`,
+          `installDeps: --pure-lockfile --check-files`,
           `writeFile: ${dummyPackageJson}`
         ]);
       });