diff --git a/ospfd/ospf_spf.c b/ospfd/ospf_spf.c
index 8399e18..5ced71c 100644
--- a/ospfd/ospf_spf.c
+++ b/ospfd/ospf_spf.c
@@ -1132,7 +1132,7 @@
     delay = ospf->spf_delay;
 
   if (IS_DEBUG_OSPF_EVENT)
-    zlog_info ("SPF: calculation timer delay = %ld", delay);
+    zlog_info ("SPF: calculation timer delay = %ld", (long)delay);
   ospf->t_spf_calc =
     thread_add_timer (master, ospf_spf_calculate_timer, ospf, delay);
 }