diff --git a/ospfd/ospf_snmp.c b/ospfd/ospf_snmp.c
index 3be3ce4..ccb6498 100644
--- a/ospfd/ospf_snmp.c
+++ b/ospfd/ospf_snmp.c
@@ -919,7 +919,7 @@
   struct ospf *ospf;
   struct ospf_area *area;
   struct ospf_lsa *lsa;
-  int len;
+  unsigned int len;
   int type_next;
   int ls_id_next;
   int router_id_next;
@@ -1130,7 +1130,7 @@
 {
   oid *offset;
   int offsetlen;
-  int len;
+  unsigned int len;
   struct ospf *ospf;
   struct ospf_area *area;
   struct ospf_area_range *range;
@@ -1566,7 +1566,7 @@
 ospfIfLookup (struct variable *v, oid *name, size_t *length,
 	      struct in_addr *ifaddr, unsigned int *ifindex, int exact)
 {
-  int len;
+  unsigned int len;
   int ifaddr_next = 0;
   int ifindex_next = 0;
   struct interface *ifp;
@@ -1731,7 +1731,7 @@
 ospfIfMetricLookup (struct variable *v, oid *name, size_t *length,
 		    struct in_addr *ifaddr, unsigned int *ifindex, int exact)
 {
-  int len;
+  unsigned int len;
   int ifaddr_next = 0;
   int ifindex_next = 0;
   struct interface *ifp;
@@ -1943,7 +1943,7 @@
 		  struct in_addr *area_id, struct in_addr *neighbor, int exact)
 {
   int first;
-  int len;
+  unsigned int len;
   struct ospf_vl_data *vl_data;
 
   if (exact)
@@ -2128,7 +2128,7 @@
 ospfNbrLookup (struct variable *v, oid *name, size_t *length,
 	       struct in_addr *nbr_addr, unsigned int *ifindex, int exact)
 {
-  int len;
+  unsigned int len;
   int first;
   struct ospf_neighbor *nbr;
   struct ospf *ospf;
@@ -2300,7 +2300,7 @@
   oid *offset;
   int offsetlen;
   u_char lsa_type;
-  int len;
+  unsigned int len;
   struct ospf_lsa *lsa;
   struct ospf *ospf;
 
@@ -2477,8 +2477,6 @@
 void
 ospf_snmp_init ()
 {
-  struct ospf *ospf;
-
   ospf_snmp_iflist = list_new ();
   ospf_snmp_vl_table = route_table_init ();
   smux_init (om->master, ospfd_oid, sizeof (ospfd_oid) / sizeof (oid));