--- pptpd-1.3.4-orig/pptpdefs.h	2006-12-08 01:01:40.000000000 +0100
+++ pptpd-1.3.4/pptpdefs.h	2007-11-13 16:49:48.000000000 +0100
@@ -309,7 +309,7 @@
 	u_int32_t seq;		/* sequence number.  Present if S==1 */
 	u_int32_t ack;		/* seq number of highest packet recieved by */
 	/* sender in this session */
-};
+} __attribute__((packed)); 
 
 /* For our call ID pairs */
 #define PNS_VALUE 0