diff --git a/src/mm-iface-modem-3gpp-ussd.c b/src/mm-iface-modem-3gpp-ussd.c
index e0ee4669..8eff818c 100644
--- a/src/mm-iface-modem-3gpp-ussd.c
+++ b/src/mm-iface-modem-3gpp-ussd.c
@@ -10,6 +10,7 @@
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  * GNU General Public License for more details:
  *
+ * Copyright (C) 2010 Guido Guenther <agx@sigxcpu.org>
  * Copyright (C) 2012 Google, Inc.
  */
 
diff --git a/src/mm-iface-modem-3gpp-ussd.h b/src/mm-iface-modem-3gpp-ussd.h
index 47658b67..e8d25de6 100644
--- a/src/mm-iface-modem-3gpp-ussd.h
+++ b/src/mm-iface-modem-3gpp-ussd.h
@@ -10,6 +10,7 @@
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  * GNU General Public License for more details:
  *
+ * Copyright (C) 2010 Guido Guenther <agx@sigxcpu.org>
  * Copyright (C) 2012 Google, Inc.
  */