diff --git a/src/brpc/grpc.cpp b/src/brpc/grpc.cpp
index 0da3b89fdc..87f98c028d 100644
--- a/src/brpc/grpc.cpp
+++ b/src/brpc/grpc.cpp
@@ -17,6 +17,7 @@
 
 
 
+#include <cstdint>                  // int64_t
 #include <sstream>                  // std::stringstream
 #include <iomanip>                  // std::setw
 #include "brpc/grpc.h"