diff --git a/sys/netinet/in.h b/sys/netinet/in.h
index 5f3c536185d6..1476bf445f94 100644
--- a/sys/netinet/in.h
+++ b/sys/netinet/in.h
@@ -228,7 +228,7 @@ __END_DECLS
 #define	IPPROTO_APES		99		/* any private encr. scheme */
 #define	IPPROTO_GMTP		100		/* GMTP*/
 #define	IPPROTO_IPCOMP		108		/* payload compression (IPComp) */
-#define IPPROTO_SCTP 		132		/* SCTP */
+#define	IPPROTO_SCTP		132		/* SCTP */
 /* 101-254: Partly Unassigned */
 #define	IPPROTO_PIM		103		/* Protocol Independent Mcast */
 #define	IPPROTO_CARP		112		/* CARP */