Guard headers tool.
diff --git a/include/grpc++/client_context.h b/include/grpc++/client_context.h
index c5a213e..87e5e9a 100644
--- a/include/grpc++/client_context.h
+++ b/include/grpc++/client_context.h
@@ -31,8 +31,8 @@
*
*/
-#ifndef __GRPCPP_CLIENT_CONTEXT_H__
-#define __GRPCPP_CLIENT_CONTEXT_H__
+#ifndef GRPCXX_CLIENT_CONTEXT_H
+#define GRPCXX_CLIENT_CONTEXT_H
#include <chrono>
#include <map>
@@ -151,4 +151,4 @@
} // namespace grpc
-#endif // __GRPCPP_CLIENT_CONTEXT_H__
+#endif // GRPCXX_CLIENT_CONTEXT_H