diff -Nru 0.5.3/src/ntlm.c 0.5.3a/src/ntlm.c
--- 0.5.3/src/ntlm.c	2006-03-10 21:25:50.000000000 +0200
+++ 0.5.3a/src/ntlm.c	2006-10-15 11:40:04.000000000 +0300
@@ -74,7 +74,8 @@
 	len = (strlen(hostname) << 1);
 	chal->dom_len[0] = len;
 	chal->dom_max_len[0] = len;
-	chal->dom_offset[0] =  (unsigned)chal->data - (unsigned)chal;
+	chal->dom_offset[0] =  (unsigned char)((unsigned char *)chal->data - (unsigned char *)chal);
+
 	chal->flags[0] = 0x03;
 	chal->flags[1] = 0x82;
 	chal->flags[2] = 0x81;