diff --git a/Common/ret_errno.h b/Common/ret_errno.h
index f46b7d260..70b47d236 100644
--- a/Common/ret_errno.h
+++ b/Common/ret_errno.h
@@ -33,6 +33,7 @@ typedef unsigned int ret_code;
 /* NETCONFIG_MODULE 0x00010000 ~ 0x0001ffff*/
 #define RET_IPINVALID         (unsigned int)((unsigned int)NETCONFIG_MODULE<<16|1)
 #define RET_BRNAMEERR         (unsigned int)((unsigned int)NETCONFIG_MODULE<<16|2)
+#define RET_NETMASKERR         (unsigned int)((unsigned int)NETCONFIG_MODULE<<16|3)
 
 /* VLANCONFIG_MODULE 0x00050000 ~ 0x0005ffff*/
 #define RET_VIDNUM_INVALID        (unsigned int)((unsigned int)VLAN_CONFIG_MODULE<<16|1)
@@ -95,6 +96,7 @@ typedef unsigned int ret_code;
 \
     { RET_IPINVALID,  "IpInvalid"},\
     { RET_BRNAMEERR,  "BrNameInvalid"},\
+	{ RET_NETMASKERR, "NetMaskInvalid"},\
 \
     { RET_VIDNUM_INVALID,	"VidNumInvalid"},\
     { RET_VID_INVALID,     	"VidValueInvalid"},\