1 files changed, 2 insertions, 2 deletions
diff --git a/test/cpp/interop/interop_client.cc b/test/cpp/interop/interop_client.cc
index 3051afa86b..2ea1d3f79a 100644
--- a/test/cpp/interop/interop_client.cc
+++ b/test/cpp/interop/interop_client.cc
@@ -875,7 +875,7 @@ bool InteropClient::DoCacheableUnary() {
 
   // Create request with current timestamp
   gpr_timespec ts = gpr_now(GPR_CLOCK_PRECISE);
-  std::string timestamp = std::to_string((long long unsigned)ts.tv_nsec);
+  std::string timestamp = std::to_string(static_cast<long long unsigned>(ts.tv_nsec));
   SimpleRequest request;
   request.mutable_payload()->set_body(timestamp.c_str(), timestamp.size());
 
@@ -914,7 +914,7 @@ bool InteropClient::DoCacheableUnary() {
   // Request 3
   // Modify the request body so it will not get a cache hit
   ts = gpr_now(GPR_CLOCK_PRECISE);
-  timestamp = std::to_string((long long unsigned)ts.tv_nsec);
+  timestamp = std::to_string(static_cast<long long unsigned>(ts.tv_nsec));
   SimpleRequest request1;
   request1.mutable_payload()->set_body(timestamp.c_str(), timestamp.size());
   ClientContext context3;