diff --git a/wrap/utilities.cpp b/wrap/utilities.cpp
index 71373c8e6..7b82d9b9d 100644
--- a/wrap/utilities.cpp
+++ b/wrap/utilities.cpp
@@ -15,6 +15,7 @@
  **/
 
 #include <iostream>
+#include <cstdlib>
 
 #include <boost/foreach.hpp>