diff --git a/ospf6d/ospf6_interface.h b/ospf6d/ospf6_interface.h
index 2d1ff34..d80b073 100644
--- a/ospf6d/ospf6_interface.h
+++ b/ospf6d/ospf6_interface.h
@@ -64,6 +64,8 @@
   u_int16_t dead_interval;
   u_int32_t rxmt_interval;
 
+  u_int32_t state_change;
+
   /* Cost */
   u_int32_t cost;