diff --git a/ospfd/ospf_abr.c b/ospfd/ospf_abr.c
index 9f3a587..e23ace2 100644
--- a/ospfd/ospf_abr.c
+++ b/ospfd/ospf_abr.c
@@ -596,7 +596,7 @@
   struct summary_lsa *header;
   u_char *mp;
   metric = htonl (metric);
-  mp = (char *) &metric;
+  mp = (u_char *) &metric;
   mp++;
   header = (struct summary_lsa *) lsa->data;
   memcpy(header->metric, mp, 3);