--- ./include/grpc++/impl/codegen/config.h	2017-06-28 01:16:01.000000000 +0530
+++ ../config.h	2017-07-08 22:48:38.993186926 +0530
@@ -49,8 +49,6 @@
 
 typedef GRPC_CUSTOM_STRING string;
 
-using std::to_string;
-
 }  // namespace grpc
 
 #endif  // GRPCXX_IMPL_CODEGEN_CONFIG_H