diff --git a/sys/netpfil/ipfw/ip_fw_dynamic.c b/sys/netpfil/ipfw/ip_fw_dynamic.c
index f28dfcbd6936..af546f43fc20 100644
--- a/sys/netpfil/ipfw/ip_fw_dynamic.c
+++ b/sys/netpfil/ipfw/ip_fw_dynamic.c
@@ -248,6 +248,7 @@ SYSEND
 #endif /* SYSCTL_NODE */
 
 
+#ifdef INET6
 static __inline int
 hash_packet6(struct ipfw_flow_id *id)
 {
@@ -259,6 +260,7 @@ hash_packet6(struct ipfw_flow_id *id)
 	    (id->dst_port) ^ (id->src_port);
 	return i;
 }
+#endif
 
 /*
  * IMPORTANT: the hash function for dynamic rules must be commutative
diff --git a/sys/netpfil/ipfw/ip_fw_table.c b/sys/netpfil/ipfw/ip_fw_table.c
index b67ed640ad04..31eebfe802ac 100644
--- a/sys/netpfil/ipfw/ip_fw_table.c
+++ b/sys/netpfil/ipfw/ip_fw_table.c
@@ -123,6 +123,7 @@ struct table_xentry {
 #define OFF_LEN_IFACE	(8 * offsetof(struct xaddr_iface, ifname))
 
 
+#ifdef INET6
 static inline void
 ipv6_writemask(struct in6_addr *addr6, uint8_t mask)
 {
@@ -132,6 +133,7 @@ ipv6_writemask(struct in6_addr *addr6, uint8_t mask)
 		*cp++ = 0xFFFFFFFF;
 	*cp = htonl(mask ? ~((1 << (32 - mask)) - 1) : 0);
 }
+#endif
 
 int
 ipfw_add_table_entry(struct ip_fw_chain *ch, uint16_t tbl, void *paddr,