diff --git a/sys/netatalk/at.h b/sys/netatalk/at.h
index 8d2f90a0df9..11504f06d35 100644
--- a/sys/netatalk/at.h
+++ b/sys/netatalk/at.h
@@ -89,4 +89,4 @@ struct sockaddr_at {
 
 #define sat_zero sat_range.r_zero
 
-#endif __AT_HEADER__
+#endif /* !__AT_HEADER__ */
diff --git a/sys/netatalk/endian.h b/sys/netatalk/endian.h
index 255c2268450..4786e8d334f 100644
--- a/sys/netatalk/endian.h
+++ b/sys/netatalk/endian.h
@@ -26,4 +26,4 @@
 
 #include <machine/endian.h>
 
-#endif _ATALK_ENDIAN_H_
+#endif /* !_ATALK_ENDIAN_H_ */