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-rw-r--r--test/cpp/util/grpc_tool.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/test/cpp/util/grpc_tool.h b/test/cpp/util/grpc_tool.h
index 3da86937c2..df3680258b 100644
--- a/test/cpp/util/grpc_tool.h
+++ b/test/cpp/util/grpc_tool.h
@@ -45,7 +45,7 @@ namespace testing {
typedef std::function<bool(const grpc::string &)> GrpcToolOutputCallback;
-int GrpcToolMainLib(int argc, const char **argv, CliCredentials cred,
+int GrpcToolMainLib(int argc, const char **argv, const CliCredentials &cred,
GrpcToolOutputCallback callback);
} // namespace testing