diff --git a/ospf6d/ospf6_spf.c b/ospf6d/ospf6_spf.c
index a4a5b72..da0ee13 100644
--- a/ospf6d/ospf6_spf.c
+++ b/ospf6d/ospf6_spf.c
@@ -473,6 +473,8 @@
     }
 
   pqueue_delete (candidate_list);
+
+  oa->spf_calculation++;
 }
 
 static void