===================================================================
RCS file: /cvs/mandoc/term_ascii.c,v
retrieving revision 1.51
retrieving revision 1.52
diff -u -p -r1.51 -r1.52
--- mandoc/term_ascii.c	2015/10/13 22:59:54	1.51
+++ mandoc/term_ascii.c	2015/11/12 21:50:03	1.52
@@ -1,4 +1,4 @@
-/*	$Id: term_ascii.c,v 1.51 2015/10/13 22:59:54 schwarze Exp $ */
+/*	$Id: term_ascii.c,v 1.52 2015/11/12 21:50:03 schwarze Exp $ */
 /*
  * Copyright (c) 2010, 2011 Kristaps Dzonsons <kristaps@bsd.lv>
  * Copyright (c) 2014, 2015 Ingo Schwarze <schwarze@openbsd.org>
@@ -88,8 +88,16 @@ ascii_init(enum termenc enc, const struct manoutput *o
 
 #if HAVE_WCHAR
 	if (TERMENC_ASCII != enc) {
+
+		/*
+		 * Do not change any of this to LC_ALL.  It might break
+		 * the formatting by subtly changing the behaviour of
+		 * various functions, for example strftime(3).  As a
+		 * worst case, it might even cause buffer overflows.
+		 */
+
 		v = TERMENC_LOCALE == enc ?
-		    setlocale(LC_ALL, "") :
+		    setlocale(LC_CTYPE, "") :
 		    setlocale(LC_CTYPE, "en_US.UTF-8");
 		if (NULL != v && MB_CUR_MAX > 1) {
 			p->enc = enc;