UINT8 CredTypeLen;\r
} PXEBC_VENDOR_OPTION;\r
\r
-#define PXEBC_CACHED_DHCP4_PACKET_MAX_SIZE (EFI_FIELD_OFFSET (EFI_DHCP4_PACKET, Dhcp4) + PXEBC_DHCP4_MAX_PACKET_SIZE)\r
+#define PXEBC_CACHED_DHCP4_PACKET_MAX_SIZE (OFFSET_OF (EFI_DHCP4_PACKET, Dhcp4) + PXEBC_DHCP4_MAX_PACKET_SIZE)\r
\r
typedef struct {\r
union {\r