|  | @@ -850,7 +850,7 @@ bool InteropClient::DoCacheableUnary() {
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				|  |  |    // Create request with current timestamp
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				|  |  |    gpr_timespec ts = gpr_now(GPR_CLOCK_PRECISE);
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				|  |  | -  std::string timestamp = std::to_string(ts.tv_nsec);
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				|  |  | +  std::string timestamp = std::to_string((long long unsigned)ts.tv_nsec);
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				|  |  |    SimpleRequest request;
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				|  |  |    request.mutable_payload()->set_body(timestamp.c_str(), timestamp.size());
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