diff --git a/desmume/src/cheatSystem.h b/desmume/src/cheatSystem.h
index 4b5e641f0..fdfda2952 100644
--- a/desmume/src/cheatSystem.h
+++ b/desmume/src/cheatSystem.h
@@ -17,6 +17,7 @@
     Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301  USA
 */
 
+#include <stdlib.h>
 #include <string.h>
 #include "common.h"
 #include <vector>