diff --git a/lib/libpfctl/libpfctl.c b/lib/libpfctl/libpfctl.c
--- a/lib/libpfctl/libpfctl.c
+++ b/lib/libpfctl/libpfctl.c
@@ -1335,17 +1335,25 @@
 	nvlist_t	*nvl;
 	int		 ret;
 	uint		 state_limit;
+	uint64_t	 lim, hi, lo;
 
 	ret = pfctl_get_limit(dev, PF_LIMIT_STATES, &state_limit);
 	if (ret != 0)
 		return (ret);
 
+	lim = state_limit;
+	hi = lim * s->highwater / 100;
+	lo = lim * s->lowwater / 100;
+
+	if (lo == hi)
+		hi++;
+
 	nvl = nvlist_create(0);
 
 	nvlist_add_bool(nvl, "enabled", s->mode != PFCTL_SYNCOOKIES_NEVER);
 	nvlist_add_bool(nvl, "adaptive", s->mode == PFCTL_SYNCOOKIES_ADAPTIVE);
-	nvlist_add_number(nvl, "highwater", state_limit * s->highwater / 100);
-	nvlist_add_number(nvl, "lowwater", state_limit * s->lowwater / 100);
+	nvlist_add_number(nvl, "highwater", hi);
+	nvlist_add_number(nvl, "lowwater", lo);
 
 	nv.data = nvlist_pack(nvl, &nv.len);
 	nv.size = nv.len;