diff --git a/unittest/return_by_ref.cpp b/unittest/return_by_ref.cpp
index 12f24c4b3668f3c89271d2f36fa3534e7c258116..45d5c46e157c9b49d877acb87e90a13196056c94 100644
--- a/unittest/return_by_ref.cpp
+++ b/unittest/return_by_ref.cpp
@@ -1,6 +1,5 @@
 /*
- * Copyright 2014-2019, CNRS
- * Copyright 2018-2020, INRIA
+ * Copyright 2020 INRIA
  */
 
 #include "eigenpy/eigenpy.hpp"