diff --git a/games/hack/makedefs.c b/games/hack/makedefs.c
index aa113b9fed8..1097ba55e11 100644
--- a/games/hack/makedefs.c
+++ b/games/hack/makedefs.c
@@ -2,6 +2,7 @@
 /* makedefs.c - version 1.0.2 */
 
 #include <stdio.h>
+#include <string.h>
 
 /* construct definitions of object constants */
 #define	LINSZ	1000
diff --git a/games/phantasia/fight.c b/games/phantasia/fight.c
index 93b2d18c995..54002bfacf8 100644
--- a/games/phantasia/fight.c
+++ b/games/phantasia/fight.c
@@ -2,6 +2,7 @@
  * fight.c   Phantasia monster fighting routines
  */
 
+#include <string.h>
 #include "include.h"
 
 /************************************************************************