diff --git a/cmake/generic.cmake b/cmake/generic.cmake
index c749c97f13649fe8432091414b56f7d0ea8ace8b..c0808ac06cc78181baaa753df82f64ceb7392c16 100644
--- a/cmake/generic.cmake
+++ b/cmake/generic.cmake
@@ -597,6 +597,9 @@ function(grpc_library TARGET_NAME)
           COMMAND ${PROTOBUF_PROTOC_EXECUTABLE}
           ARGS --grpc_out "${CMAKE_CURRENT_BINARY_DIR}" -I "${PROTO_PATH}"
           --plugin=protoc-gen-grpc="${GRPC_CPP_PLUGIN}" "${ABS_PROTO}"
+          COMMAND ${PROTOBUF_PROTOC_EXECUTABLE}
+          ARGS --cpp_out "${CMAKE_CURRENT_BINARY_DIR}" -I "${PROTO_PATH}"
+          "${ABS_PROTO}"
           DEPENDS "${ABS_PROTO}" ${PROTOBUF_PROTOC_EXECUTABLE} extern_grpc)
 
   # FIXME(typhoonzero): grpc generated code do not generate virtual-dtor, mark it