diff --git a/include/grpcpp/support/proto_buffer_reader.h b/include/grpcpp/support/proto_buffer_reader.h
index a20963582e3..f5431d462e4 100644
--- a/include/grpcpp/support/proto_buffer_reader.h
+++ b/include/grpcpp/support/proto_buffer_reader.h
@@ -76,7 +76,7 @@ class ProtoBufferReader : public grpc::protobuf::io::ZeroCopyInputStream {
     if (backup_count_ > 0) {
       *data = GRPC_SLICE_START_PTR(*slice_) + GRPC_SLICE_LENGTH(*slice_) -
               backup_count_;
-      CHECK_LE(backup_count_, static_cast<size_t>(INT_MAX));
+      CHECK_LE(backup_count_, INT_MAX);
       *size = static_cast<int>(backup_count_);
       backup_count_ = 0;
       return true;