diff --git a/games/backgammon/backgammon/main.c b/games/backgammon/backgammon/main.c
index d5b059c93d6f..6d18876ea3cf 100644
--- a/games/backgammon/backgammon/main.c
+++ b/games/backgammon/backgammon/main.c
@@ -43,6 +43,7 @@ static char sccsid[] = "@(#)main.c	8.1 (Berkeley) 5/31/93";
 
 #include <stdio.h>
 #include <unistd.h>
+#include <string.h>
 #include "back.h"
 
 #define MVPAUSE	5				/* time to sleep when stuck */
diff --git a/games/backgammon/common_source/subs.c b/games/backgammon/common_source/subs.c
index 3c9602636d87..7f46571b1a65 100644
--- a/games/backgammon/common_source/subs.c
+++ b/games/backgammon/common_source/subs.c
@@ -37,6 +37,7 @@ static char sccsid[] = "@(#)subs.c	8.1 (Berkeley) 5/31/93";
 
 #include <stdio.h>
 #include <stdlib.h>
+#include <string.h>
 #include "back.h"
 
 int	buffnum;