diff --git a/ospfd/ChangeLog b/ospfd/ChangeLog
index e5aa066..265c9c7 100644
--- a/ospfd/ChangeLog
+++ b/ospfd/ChangeLog
@@ -1,3 +1,10 @@
+2006-03-27 Paul Jakma <paul.jakma@sun.com>
+
+	* ospf_lsa.c: (ospf_lsa_checksum) Add an explicit cast to avoid
+	  the ambiguities of ANSI and C99 C with respect to type
+	  conversion. Detailed problem report and test case with
+	  example data supplied by Dmitry Ivanov <dimss@telecentrs.lv>.
+
 2006-03-25 Paul Jakma <paul.jakma@sun.com>
 
 	* ospf_interface.c: (ospf_if_lookup_recv_if) Ignore loopbacks,
diff --git a/ospfd/ospf_lsa.c b/ospfd/ospf_lsa.c
index 12959f0..faae437 100644
--- a/ospfd/ospf_lsa.c
+++ b/ospfd/ospf_lsa.c
@@ -202,7 +202,7 @@
       c1 %= 255;
     }
 
-  x = ((length - LSA_CHECKSUM_OFFSET) * c0 - c1) % 255;
+  x = (((int)length - LSA_CHECKSUM_OFFSET) * c0 - c1) % 255;
   if (x <= 0)
     x += 255;
   y = 510 - c0 - x;