diff --git a/usr.bin/wall/wall.c b/usr.bin/wall/wall.c
index 4351888c9c4..12c4387d605 100644
--- a/usr.bin/wall/wall.c
+++ b/usr.bin/wall/wall.c
@@ -51,6 +51,7 @@ static char sccsid[] = "@(#)wall.c	8.2 (Berkeley) 11/16/93";
 #include <sys/time.h>
 #include <sys/uio.h>
 
+#include <locale.h>
 #include <paths.h>
 #include <pwd.h>
 #include <stdio.h>
@@ -81,6 +82,8 @@ main(argc, argv)
 	char *p, *ttymsg();
 	char line[sizeof(utmp.ut_line) + 1];
 
+	(void)setlocale(LC_CTYPE, "");
+
 	while ((ch = getopt(argc, argv, "n")) != -1)
 		switch (ch) {
 		case 'n':