diff --git a/include/nic_cmd_event.h b/include/nic_cmd_event.h
index 7b408ce..356b68b 100644
--- a/include/nic_cmd_event.h
+++ b/include/nic_cmd_event.h
@@ -1210,6 +1210,7 @@
 #if CFG_TCP_IP_CHKSUM_OFFLOAD
 typedef struct _NIC_CSUM_OFFLOAD_T {
 	UINT_8 ucIsSupportCsumOffload;  /* 1: Support, 0: Not Support */
+	UINT_8 acReseved[3];
 } NIC_CSUM_OFFLOAD_T, *P_NIC_CSUM_OFFLOAD_T;
 #endif