|  | @@ -764,13 +764,14 @@ class XdsEnd2endTest : public ::testing::TestWithParam<TestType> {
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				|  |  |    }
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				|  |  |  
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				|  |  |    void WaitForBackend(size_t backend_idx, bool reset_counters = true) {
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				|  |  | -    gpr_log(GPR_INFO,
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				|  |  | -            "========= WAITING FOR BACKEND %lu ==========", backend_idx);
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				|  |  | +    gpr_log(GPR_INFO, "========= WAITING FOR BACKEND %lu ==========",
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				|  |  | +            static_cast<unsigned long>(backend_idx));
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				|  |  |      do {
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				|  |  |        (void)SendRpc();
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				|  |  |      } while (backends_[backend_idx]->backend_service()->request_count() == 0);
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				|  |  |      if (reset_counters) ResetBackendCounters();
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				|  |  | -    gpr_log(GPR_INFO, "========= BACKEND %lu READY ==========", backend_idx);
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				|  |  | +    gpr_log(GPR_INFO, "========= BACKEND %lu READY ==========",
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				|  |  | +            static_cast<unsigned long>(backend_idx));
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				|  |  |    }
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				|  |  |  
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				|  |  |    grpc_core::ServerAddressList CreateAddressListFromPortList(
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