diff --git a/src/callbacks.cpp b/src/callbacks.cpp
index 70b623b81ace56fc4c5b0a7b09c00ce4258d4923..f8eb199a0bfc59e2e93d96b7ab3a6b8d615b7412 100644
--- a/src/callbacks.cpp
+++ b/src/callbacks.cpp
@@ -1,3 +1,25 @@
+/*
+ *  Copyright (C) 2014-2019 Savoir-faire Linux Inc.
+ *  Author(s) : Adrien Béraud <adrien.beraud@savoirfairelinux.com>
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program. If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
 #include "callbacks.h"
 
 namespace dht {