diff --git a/decor/on_complete.go b/decor/on_complete.go
index bb4a563..714a0de 100644
--- a/decor/on_complete.go
+++ b/decor/on_complete.go
@@ -10,6 +10,10 @@
 	d := &onCompleteWrapper{
 		Decorator: decorator,
 		msg:       message,
+	}
+	if md, ok := decorator.(*mergeDecorator); ok {
+		d.Decorator, md.Decorator = md.Decorator, d
+		return md
 	}
 	return d
 }