diff --git a/src/storage.ts b/src/storage.ts
index 681145d3d..224a70b2c 100644
--- a/src/storage.ts
+++ b/src/storage.ts
@@ -33,6 +33,7 @@ import {DEFAULT_UNIVERSE} from 'google-auth-library';
 
 export interface GetServiceAccountOptions {
   userProject?: string;
+  projectIdentifier?: string;
 }
 export interface ServiceAccount {
   emailAddress?: string;
diff --git a/test/index.ts b/test/index.ts
index 34104d743..6d10c02a3 100644
--- a/test/index.ts
+++ b/test/index.ts
@@ -1344,7 +1344,10 @@ describe('Storage', () => {
     });
 
     it('should allow user options', done => {
-      const options = {};
+      const options = {
+        projectIdentifier: 'test-identifier',
+        userProject: 'test-user-project',
+      };
 
       storage.request = (reqOpts: DecorateRequestOptions) => {
         assert.strictEqual(reqOpts.qs, options);