diff --git a/bus/test-launch-helper.c b/bus/test-launch-helper.c
index 42126e19..3b0d0d99 100644
--- a/bus/test-launch-helper.c
+++ b/bus/test-launch-helper.c
@@ -1,7 +1,8 @@
 /* -*- mode: C; c-file-style: "gnu"; indent-tabs-mode: nil; -*- */
 /* test-main.c  main() for the OOM check of the launch helper
  *
- * Copyright (C) 2007 Red Hat, Inc.
+ * Copyright 2007 Red Hat, Inc.
+ * Copyright 2013-2018 Collabora Ltd.
  *
  * Licensed under the Academic Free License version 2.1
  *
diff --git a/bus/test-main.c b/bus/test-main.c
index d1a61de7..d6dbe8b3 100644
--- a/bus/test-main.c
+++ b/bus/test-main.c
@@ -1,7 +1,8 @@
 /* -*- mode: C; c-file-style: "gnu"; indent-tabs-mode: nil; -*- */
 /* test-main.c  main() for make check
  *
- * Copyright (C) 2003 Red Hat, Inc.
+ * Copyright 2003-2009 Red Hat, Inc.
+ * Copyright 2011-2018 Collabora Ltd.
  *
  * Licensed under the Academic Free License version 2.1
  *
diff --git a/bus/test-system.c b/bus/test-system.c
index 875c035d..a2a4458e 100644
--- a/bus/test-system.c
+++ b/bus/test-system.c
@@ -1,7 +1,8 @@
 /* -*- mode: C; c-file-style: "gnu" -*- */
 /* test-main.c  main() for make check
  *
- * Copyright (C) 2003 Red Hat, Inc.
+ * Copyright 2003-2007 Red Hat, Inc.
+ * Copyright 2013-2018 Collabora Ltd.
  *
  * Licensed under the Academic Free License version 2.1
  *
diff --git a/bus/test.c b/bus/test.c
index 730cd64a..42651e77 100644
--- a/bus/test.c
+++ b/bus/test.c
@@ -1,7 +1,9 @@
 /* -*- mode: C; c-file-style: "gnu"; indent-tabs-mode: nil; -*- */
 /* test.c  unit test routines
  *
- * Copyright (C) 2003 Red Hat, Inc.
+ * Copyright 2003-2004 Red Hat, Inc.
+ * Copyright 2011 Collabora Ltd.
+ * Copyright 2018 Laurent Bigonville
  *
  * Licensed under the Academic Free License version 2.1
  *
diff --git a/bus/test.h b/bus/test.h
index b80a3d76..6f1f6b0d 100644
--- a/bus/test.h
+++ b/bus/test.h
@@ -1,7 +1,10 @@
 /* -*- mode: C; c-file-style: "gnu"; indent-tabs-mode: nil; -*- */
 /* test.h  unit test routines
  *
- * Copyright (C) 2003 Red Hat, Inc.
+ * Copyright 2003-2007 Red Hat, Inc.
+ * Copyright 2003-2004 Imendio
+ * Copyright 2009 Lennart Poettering
+ * Copyright 2018 Collabora Ltd.
  *
  * Licensed under the Academic Free License version 2.1
  *