diff --git a/gtp/pdp.h b/gtp/pdp.h
index 62175ef..a6780cd 100644
--- a/gtp/pdp.h
+++ b/gtp/pdp.h
@@ -199,7 +199,7 @@
   int         version;  /* Protocol version currently in use. 0 or 1 */
 
   uint64_t    tid;      /* Combination of imsi and nsapi */
-  u_int16_t   seq;      /* Sequence number of last request */
+  uint16_t   seq;      /* Sequence number of last request */
   struct sockaddr_in sa_peer; /* Address of last request */
   int fd;               /* File descriptor request was received on */