diff --git a/DynamicModel.cc b/DynamicModel.cc
index f41066f1..fe112d63 100644
--- a/DynamicModel.cc
+++ b/DynamicModel.cc
@@ -18,6 +18,7 @@
  */
 
 #include <cmath>
+#include <cstdlib>
 
 #include "DynamicModel.hh"
 
diff --git a/StaticModel.cc b/StaticModel.cc
index 24fb837a..320ba2d4 100644
--- a/StaticModel.cc
+++ b/StaticModel.cc
@@ -17,6 +17,8 @@
  * along with Dynare.  If not, see <http://www.gnu.org/licenses/>.
  */
 
+#include <cstdlib>
+
 #include "StaticModel.hh"
 
 StaticModel::StaticModel(SymbolTable &symbol_table_arg,