diff --git a/nest/locks.h b/nest/locks.h
index e465bf55..892d3c6b 100644
--- a/nest/locks.h
+++ b/nest/locks.h
@@ -43,6 +43,7 @@ void olock_init(void);
 
 #define OBJLOCK_UDP 1			/* UDP port */
 #define OBJLOCK_TCP 2			/* TCP port */
+#define OBJLOCK_IP 3			/* IP protocol */
 
 #define OLOCK_STATE_FREE 0
 #define OLOCK_STATE_LOCKED 1
diff --git a/proto/ospf/iface.c b/proto/ospf/iface.c
index 70ad7462..c9e1808e 100644
--- a/proto/ospf/iface.c
+++ b/proto/ospf/iface.c
@@ -310,7 +310,7 @@ ospf_if_notify(struct proto *p, unsigned flags, struct iface *iface)
       OSPF_TRACE(D_EVENTS, "Using interface %s.", iface->name);
       lock = olock_new( p->pool );
       lock->addr = AllSPFRouters;
-      lock->type = OBJLOCK_UDP;
+      lock->type = OBJLOCK_IP;
       lock->port = OSPF_PROTO;
       lock->iface = iface;
       lock->data = p;