diff --git a/src/openvpn/networking_iproute2.c b/src/openvpn/networking_iproute2.c
index f3b9c614..3b460527 100644
--- a/src/openvpn/networking_iproute2.c
+++ b/src/openvpn/networking_iproute2.c
@@ -88,6 +88,8 @@ net_iface_mtu_set(openvpn_net_ctx_t *ctx, const char *iface, uint32_t mtu)
     argv_msg(M_INFO, &argv);
     openvpn_execve_check(&argv, ctx->es, S_FATAL, "Linux ip link set failed");
 
+    argv_free(&argv);
+
     return 0;
 }