-                       unsigned char  HeaderLength   : 4; /**< Total length of the packet header, in 4-byte blocks */
-                       unsigned char  Version        : 4; /**< IP protocol version */
-                       uint8_t        TypeOfService; /**< Special service type identifier, indicating delay/throughput/reliability levels */
-                       uint16_t       TotalLength; /**< Total length of the IP packet, in bytes */
+                       unsigned     HeaderLength   : 4; /**< Total length of the packet header, in 4-byte blocks */
+                       unsigned     Version        : 4; /**< IP protocol version */
+                       uint8_t      TypeOfService; /**< Special service type identifier, indicating delay/throughput/reliability levels */
+                       uint16_t     TotalLength; /**< Total length of the IP packet, in bytes */