diff --git a/test/cpp/interop/stress_test.cc b/test/cpp/interop/stress_test.cc
index 91ef92af378fd5db5c0249b82059ce4045967b95..a1f678080923b4e78a44a08e6d57600d50e3c1d5 100644
--- a/test/cpp/interop/stress_test.cc
+++ b/test/cpp/interop/stress_test.cc
@@ -80,10 +80,10 @@ DEFINE_string(test_cases, "",
 
 using std::make_pair;
 using std::pair;
-using std::string;
 using std::thread;
 using std::vector;
 
+using grpc::string;
 using grpc::testing::kTestCaseList;
 using grpc::testing::StressTestInteropClient;
 using grpc::testing::TestCaseType;