diff --git a/ospfd/ospf_lsa.c b/ospfd/ospf_lsa.c
index 34d71b6..944af64 100644
--- a/ospfd/ospf_lsa.c
+++ b/ospfd/ospf_lsa.c
@@ -186,7 +186,7 @@
 
   lsa->checksum = 0;
   length = ntohs (lsa->length) - 2;
-  sp = (char *) &lsa->options;
+  sp = (u_char *) &lsa->options;
 
   for (ep = sp + length; sp < ep; sp = q)
     {