diff --git a/usr.bin/w/w.c b/usr.bin/w/w.c
--- a/usr.bin/w/w.c
+++ b/usr.bin/w/w.c
@@ -135,14 +135,13 @@
 	char buf[MAXHOSTNAMELEN], fn[MAXHOSTNAMELEN];
 	char *dot;
 
-
 	argc = xo_parse_args(argc, argv);
 	if (argc < 0)
 		exit(1);
 
-	if (xo_get_style(NULL) == XO_STYLE_TEXT) {
-		setlocale(LC_ALL, "");
-	}
+	setlocale(LC_ALL, "");
+	if (xo_get_style(NULL) != XO_STYLE_TEXT)
+		setlocale(LC_NUMERIC, "C");
 	use_ampm = (*nl_langinfo(T_FMT_AMPM) != '\0');
 	use_comma = (*nl_langinfo(RADIXCHAR) != ',');
 	/* Are we w(1) or uptime(1)? */