diff --git a/inc/protocol.h b/inc/protocol.h
--- a/inc/protocol.h
+++ b/inc/protocol.h
@@ -1,5 +1,5 @@
-#ifndef _PROTOCOL_H
-#define _PROTOCOL_H
+#ifndef _PROTOCOL_H_
+#define _PROTOCOL_H_
 
 #include <stdbool.h>
 
@@ -58,4 +58,4 @@ bool protocol_process_message(protocol_m
 __weak bool protocol_get_data(protocol_message_t* message);
 __weak bool protocol_config(protocol_message_t* message);
 
-#endif //_PROTOCOL_H
+#endif //_PROTOCOL_H_