diff --git a/LDP/howto/docbook/NCURSES-Programming-HOWTO/resources/ncurses_programs/JustForFun/tt.c b/LDP/howto/docbook/NCURSES-Programming-HOWTO/resources/ncurses_programs/JustForFun/tt.c
index 4378e670..cb31e302 100644
--- a/LDP/howto/docbook/NCURSES-Programming-HOWTO/resources/ncurses_programs/JustForFun/tt.c
+++ b/LDP/howto/docbook/NCURSES-Programming-HOWTO/resources/ncurses_programs/JustForFun/tt.c
@@ -1,5 +1,6 @@
 #include <curses.h>
 #include <stdio.h>
+#include <string.h>
 #include <stdlib.h>
 #include <time.h>