diff --git a/pkg/addonmanager/controllers/registration/controller.go b/pkg/addonmanager/controllers/registration/controller.go
index f1888e3ec..28a0c6016 100644
--- a/pkg/addonmanager/controllers/registration/controller.go
+++ b/pkg/addonmanager/controllers/registration/controller.go
@@ -99,6 +99,7 @@ func (c *addonRegistrationController) sync(ctx context.Context, syncCtx factory.
 
 	// wait until the mca's ownerref is set.
 	if !utils.IsOwnedByCMA(managedClusterAddonCopy) {
+		klog.Warningf("OwnerReferences is not set for %q", key)
 		return nil
 	}