diff --git a/src/utils/utils.cpp b/src/utils/utils.cpp
index 029baaa34..3fa701d60 100644
--- a/src/utils/utils.cpp
+++ b/src/utils/utils.cpp
@@ -16,6 +16,8 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
+#include <cstdlib>
+
 #include "utils.h"
 
 using namespace std;