diff --git a/sys/net/pfvar.h b/sys/net/pfvar.h
--- a/sys/net/pfvar.h
+++ b/sys/net/pfvar.h
@@ -571,7 +571,11 @@
 
 #ifdef _KERNEL
 
-void				 unhandled_af(int) __dead2;
+static inline __dead2 void
+unhandled_af(int af)
+{
+	panic("unhandled af %d", af);
+}
 
 static void inline
 pf_addrcpy(struct pf_addr *dst, const struct pf_addr *src, sa_family_t af)
diff --git a/sys/netpfil/pf/pf_ioctl.c b/sys/netpfil/pf/pf_ioctl.c
--- a/sys/netpfil/pf/pf_ioctl.c
+++ b/sys/netpfil/pf/pf_ioctl.c
@@ -2521,12 +2521,6 @@
 	return (killed);
 }
 
-void
-unhandled_af(int af)
-{
-	panic("unhandled af %d", af);
-}
-
 int
 pf_start(void)
 {