diff --git a/src/brpc/thrift_message.cpp b/src/brpc/thrift_message.cpp
index ed3d7557..7b9d210a 100644
--- a/src/brpc/thrift_message.cpp
+++ b/src/brpc/thrift_message.cpp
@@ -22,7 +22,6 @@
 #include <algorithm>
 #include "butil/logging.h"
 
-#include <google/protobuf/stubs/once.h>
 #include <google/protobuf/io/coded_stream.h>
 #include <google/protobuf/descriptor.h>
 #include <google/protobuf/reflection_ops.h>
diff --git a/src/brpc/thrift_message.h b/src/brpc/thrift_message.h
index 53041c85..471bafb5 100644
--- a/src/brpc/thrift_message.h
+++ b/src/brpc/thrift_message.h
@@ -101,7 +101,7 @@ public:
     void SerializeWithCachedSizes(
         ::google::protobuf::io::CodedOutputStream* output) const PB_310_OVERRIDE;
     ::google::protobuf::uint8* SerializeWithCachedSizesToArray(::google::protobuf::uint8* output) const PB_310_OVERRIDE;
-    int GetCachedSize() const override { return ByteSize(); }
+    int GetCachedSize() const { return ByteSize(); }
 
 protected:
     ::google::protobuf::Metadata GetMetadata() const override;