+#ifndef MSP_NET_PROTOCOL_IMPL_H_
+#define MSP_NET_PROTOCOL_IMPL_H_
+
+#include "protocol.h"
+
+namespace Msp {
+namespace Net {
+
+template<typename P>
+unsigned Protocol::PacketTypeDef<P>::class_id = 0;
+
+} // namespace Net
+} // namespace Msp
+
+#endif