diff --git a/packages/core/test/lib/base.test.ts b/packages/core/test/lib/base.test.ts
index cc25811acd31..3fa10828e32a 100644
--- a/packages/core/test/lib/base.test.ts
+++ b/packages/core/test/lib/base.test.ts
@@ -2026,7 +2026,7 @@ describe('BaseClient', () => {
         }),
       );
 
-      const mockSend = jest.spyOn(client['_transport'], 'send').mockImplementation(() => {
+      const mockSend = jest.spyOn(client.getTransport()!, 'send').mockImplementation(() => {
         return Promise.resolve({ statusCode: 200 });
       });