diff --git a/src/check.c b/src/check.c
index c326c00..1d3a307 100644
--- a/src/check.c
+++ b/src/check.c
@@ -2638,7 +2638,8 @@
 		goto error;
 	}
 
-	sk = str2sa_range(args[*cur_arg+1], NULL, &port1, &port2, errmsg, NULL, NULL, PA_O_RESOLVE);
+	sk = str2sa_range(args[*cur_arg+1], NULL, &port1, &port2, errmsg, NULL, NULL,
+	                  PA_O_RESOLVE | PA_O_PORT_OK);
 	if (!sk) {
 		memprintf(errmsg, "'%s' : %s", args[*cur_arg], *errmsg);
 		goto error;