diff --git a/sys/contrib/ipfilter/netinet/fil.c b/sys/contrib/ipfilter/netinet/fil.c
index ffb5611e2de..022129aedf1 100644
--- a/sys/contrib/ipfilter/netinet/fil.c
+++ b/sys/contrib/ipfilter/netinet/fil.c
@@ -1299,7 +1299,7 @@ ipf_pr_icmp(fin)
 			}
 		}
 #endif
-		/* fallthrough is intentional */
+		/* FALLTHROUGH */
 	case ICMP_SOURCEQUENCH :
 	case ICMP_REDIRECT :
 	case ICMP_TIMXCEED :