diff --git a/src/model/contact_mechanics/contact_mechanics_model.hh b/src/model/contact_mechanics/contact_mechanics_model.hh
index 8e796815d..6201de187 100644
--- a/src/model/contact_mechanics/contact_mechanics_model.hh
+++ b/src/model/contact_mechanics/contact_mechanics_model.hh
@@ -1,37 +1,39 @@
 /**
  * @file   contact_mechanics_model.hh
  *
  * @author Mohit Pundir <mohit.pundir@epfl.ch>
  *
  * @date creation: Tue Sep 10 2018
  * @date last modification: Mon Sep 10 2018
  *
  * @brief  Model of Contact Mechanics
  *
  * @section LICENSE
  *
  * Copyright (©)  2010-2018 EPFL (Ecole Polytechnique Fédérale de Lausanne)
  * Laboratory (LSMS - Laboratoire de Simulation en Mécanique des Solides)
  *
  * Akantu is free  software: you can redistribute it and/or  modify it under the
  * terms  of the  GNU Lesser  General Public  License as published by  the Free
  * Software Foundation, either version 3 of the License, or (at your option) any
  * later version.
  *
  * Akantu 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  Lesser General  Public License  for more
  * details.
  *
  * You should  have received  a copy  of the GNU  Lesser General  Public License
  * along with Akantu. If not, see <http://www.gnu.org/licenses/>.
  *
  */
 
-
+/* -------------------------------------------------------------------------- */
+#include "model.hh"
+/* -------------------------------------------------------------------------- */
 #ifndef __AKANTU_CONTACT_MECHANICS_MODEL_HH__
 #define __AKANTU_CONTACT_MECHANICS_MODEL_HH__
 
 
 
 #endif