diff --git a/games/backgammon/backgammon/move.c b/games/backgammon/backgammon/move.c
index 58efc6b83daf..ca128a60f27b 100644
--- a/games/backgammon/backgammon/move.c
+++ b/games/backgammon/backgammon/move.c
@@ -35,6 +35,7 @@
 static char sccsid[] = "@(#)move.c	8.1 (Berkeley) 5/31/93";
 #endif /* not lint */
 
+#include <stdlib.h>
 #include "back.h"
 
 #ifdef DEBUG