diff --git a/ospf6d/ospf6_message.c b/ospf6d/ospf6_message.c
index 09137cfed1..fe57f2f423 100644
--- a/ospf6d/ospf6_message.c
+++ b/ospf6d/ospf6_message.c
@@ -1640,7 +1640,7 @@ static void
 ospf6_send (struct in6_addr *src, struct in6_addr *dst,
             struct ospf6_interface *oi, struct ospf6_header *oh)
 {
-  int len;
+  unsigned int len;
   char srcname[64], dstname[64];
   struct iovec iovector[2];
 
diff --git a/ospfd/ospf_interface.c b/ospfd/ospf_interface.c
index 6e43462ff7..b10f4fb4f7 100644
--- a/ospfd/ospf_interface.c
+++ b/ospfd/ospf_interface.c
@@ -1028,7 +1028,7 @@ ospf_vl_set_params (struct ospf_vl_data *vl_data, struct vertex *v)
   struct ospf_interface *voi;
   struct listnode *node;
   struct vertex_parent *vp = NULL;
-  int i;
+  unsigned int i;
   struct router_lsa *rl;
 
   voi = vl_data->vl_oi;
diff --git a/ospfd/ospf_vty.c b/ospfd/ospf_vty.c
index ef6012d3ef..b730a41298 100644
--- a/ospfd/ospf_vty.c
+++ b/ospfd/ospf_vty.c
@@ -4847,7 +4847,8 @@ static void
 show_ip_ospf_database_router_links (struct vty *vty,
                                     struct router_lsa *rl)
 {
-  int len, i, type;
+  int len, type;
+  unsigned int i;
 
   len = ntohs (rl->header.length) - 4;
   for (i = 0; i < ntohs (rl->links) && len > 0; len -= 12, i++)