diff --git a/include/grpc++/fixed_size_thread_pool.h b/include/grpc++/fixed_size_thread_pool.h
index 9f0cbfbae978425d0378f5c27015d887b6aacf10..fc15d1260aeab65c703116184594d3840cab1866 100644
--- a/include/grpc++/fixed_size_thread_pool.h
+++ b/include/grpc++/fixed_size_thread_pool.h
@@ -31,8 +31,8 @@
  *
  */
 
-#ifndef GRPC_INTERNAL_CPP_SERVER_THREAD_POOL_H
-#define GRPC_INTERNAL_CPP_SERVER_THREAD_POOL_H
+#ifndef GRPCXX_FIXED_SIZE_THREAD_POOL_H
+#define GRPCXX_FIXED_SIZE_THREAD_POOL_H
 
 #include <grpc++/config.h>
 
@@ -64,4 +64,4 @@ class FixedSizeThreadPool GRPC_FINAL : public ThreadPoolInterface {
 
 }  // namespace grpc
 
-#endif  // GRPC_INTERNAL_CPP_SERVER_THREAD_POOL_H
+#endif  // GRPCXX_FIXED_SIZE_THREAD_POOL_H