diff --git a/sys/contrib/ipfilter/netinet/ip_nat.c b/sys/contrib/ipfilter/netinet/ip_nat.c
index 8372e08f791..5d0e972a0e7 100644
--- a/sys/contrib/ipfilter/netinet/ip_nat.c
+++ b/sys/contrib/ipfilter/netinet/ip_nat.c
@@ -5235,7 +5235,7 @@ ipf_nat_out(fin, nat, natadd, nflags)
 		uh->uh_ulen += fin->fin_plen;
 		uh->uh_ulen = htons(uh->uh_ulen);
 #if !defined(_KERNEL) || defined(MENTAT) || defined(__sgi) || \
-    defined(linux) || defined(BRIDGE_IPF) || defined(__FreeBSD)
+    defined(linux) || defined(BRIDGE_IPF) || defined(__FreeBSD__)
 		ipf_fix_outcksum(0, &ip->ip_sum, sumd, 0);
 #endif