diff --git a/ospfd/ospf_ism.c b/ospfd/ospf_ism.c
index 84a5dc5..17ec9b5 100644
--- a/ospfd/ospf_ism.c
+++ b/ospfd/ospf_ism.c
@@ -452,7 +452,7 @@
 ism_ignore (struct ospf_interface *oi)
 {
   if (IS_DEBUG_OSPF (ism, ISM_EVENTS))
-    zlog (NULL, LOG_INFO, "ISM[%s]: ism_ignore called", IF_NAME (oi));
+    zlog (NULL, LOG_DEBUG, "ISM[%s]: ism_ignore called", IF_NAME (oi));
 
   return 0;
 }
@@ -573,7 +573,7 @@
 
   /* Logging change of state. */
   if (IS_DEBUG_OSPF (ism, ISM_STATUS))
-    zlog (NULL, LOG_INFO, "ISM[%s]: State change %s -> %s", IF_NAME (oi),
+    zlog (NULL, LOG_DEBUG, "ISM[%s]: State change %s -> %s", IF_NAME (oi),
 	  LOOKUP (ospf_ism_state_msg, oi->state),
 	  LOOKUP (ospf_ism_state_msg, state));
 
@@ -642,7 +642,7 @@
     next_state = ISM [oi->state][event].next_state;
 
   if (IS_DEBUG_OSPF (ism, ISM_EVENTS))
-    zlog (NULL, LOG_INFO, "ISM[%s]: %s (%s)", IF_NAME (oi),
+    zlog (NULL, LOG_DEBUG, "ISM[%s]: %s (%s)", IF_NAME (oi),
 	  LOOKUP (ospf_ism_state_msg, oi->state),
 	  ospf_ism_event_str[event]);