diff --git a/src/openvpn/route.c b/src/openvpn/route.c
index 56fa7717..3b2af8b4 100644
--- a/src/openvpn/route.c
+++ b/src/openvpn/route.c
@@ -1891,6 +1891,7 @@ add_route_ipv6(struct route_ipv6 *r6, const struct tuntap *tt,

     if (!(r6->flags & RT_DEFINED) )
     {
+        argv_free(&argv);
         return;
     }