diff --git a/ospf6d/ospf6_neighbor.h b/ospf6d/ospf6_neighbor.h
index b3bd173..5f46c6f 100644
--- a/ospf6d/ospf6_neighbor.h
+++ b/ospf6d/ospf6_neighbor.h
@@ -46,6 +46,7 @@
   u_char state;
 
   /* timestamp of last changing state */
+  u_int32_t state_change;
   struct timeval last_changed;
 
   /* Neighbor Router ID */