diff --git a/usr.sbin/ppp/slcompress.c b/usr.sbin/ppp/slcompress.c
index 3e43299f35c8..f27767432bb9 100644
--- a/usr.sbin/ppp/slcompress.c
+++ b/usr.sbin/ppp/slcompress.c
@@ -17,7 +17,7 @@
  * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
  * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
  *
- * $Id: slcompress.c,v 1.26 1999/05/09 20:02:26 brian Exp $
+ * $Id: slcompress.c,v 1.27 1999/07/10 00:03:58 brian Exp $
  *
  *	Van Jacobson (van@helios.ee.lbl.gov), Dec 31, 1989:
  *	- Initial distribution.
@@ -558,7 +558,7 @@ sl_uncompress_tcp(u_char ** bufp, int len, u_int type, struct slcompress *comp,
 
     /* Watch out for alighment problems.... */
     sum = ~changes;
-    bp = cp + (int)&((struct ip *)0)->ip_sum;
+    bp = (u_short *)(cp + (int)&((struct ip *)0)->ip_sum);
     memcpy(bp, &sum, sizeof *bp);
   }
   return (len);