Index: sys/netpfil/pf/pf_ioctl.c
===================================================================
diff -u -N -r129ad4c730bfcfd589d26a2a7f944210503c8f29 -r4d0cc536ab98ae198e66549163ca10b8210dfad8
--- sys/netpfil/pf/pf_ioctl.c	(.../pf_ioctl.c)	(revision 129ad4c730bfcfd589d26a2a7f944210503c8f29)
+++ sys/netpfil/pf/pf_ioctl.c	(.../pf_ioctl.c)	(revision 4d0cc536ab98ae198e66549163ca10b8210dfad8)
@@ -1759,7 +1759,7 @@
 		struct pfsync_state	*pstore, *p;
 		int i, nr;
 
-		if (ps->ps_len == 0) {
+		if (ps->ps_len <= 0) {
 			nr = uma_zone_get_cur(V_pf_state_z);
 			ps->ps_len = sizeof(struct pfsync_state) * nr;
 			break;