diff --git a/src/conf/object_event.c b/src/conf/object_event.c
index 6b5238fc17bec0174509268fc05007a1f2c54646..c86974b030b45f1df5b05ab52f735b9c4ca38361 100644
--- a/src/conf/object_event.c
+++ b/src/conf/object_event.c
@@ -255,6 +255,11 @@ virObjectEventCallbackListAddID(virConnectPtr conn,
     size_t i;
     int ret = 0;
 
+    VIR_DEBUG("conn=%p cblist=%p uuid=%p name=%s id=%d "
+              "klass=%p eventID=%d callback=%p opaque=%p",
+              conn, cbList, uuid, name, id, klass, eventID,
+              callback, opaque);
+
     /* Check incoming */
     if (!cbList) {
         return -1;