diff --git a/iopsys-ramips/ex400/config-4.4 b/iopsys-ramips/ex400/config-4.4
index 8350e0d636168f45482cfc77426bd81350e710ce..f80897220ee41d4f2eaa09853f7261f67a52ecbb 100644
--- a/iopsys-ramips/ex400/config-4.4
+++ b/iopsys-ramips/ex400/config-4.4
@@ -502,7 +502,7 @@ CONFIG_RA_HW_NAT_UDP_DLTA=5
 CONFIG_RA_HW_NAT_TCP_DLTA=5
 CONFIG_RA_HW_NAT_FIN_DLTA=5
 CONFIG_RA_HW_NAT_NTU_DLTA=5
-CONFIG_RA_HW_NAT_IPV6=y
+# CONFIG_RA_HW_NAT_IPV6 is not set
 # CONFIG_RA_HW_NAT_PREBIND is not set
 # CONFIG_PPE_MCAST is not set
 CONFIG_RA_HW_NAT_WIFI=y