===================================================================
RCS file: /cvsrepo/anoncvs/cvs/src/usr.bin/head/head.c,v
retrieving revision 1.15
retrieving revision 1.16
diff -u -r1.15 -r1.16
--- src/usr.bin/head/head.c	2009/10/27 23:59:38	1.15
+++ src/usr.bin/head/head.c	2013/11/26 13:21:17	1.16
@@ -1,4 +1,4 @@
-/*	$OpenBSD: head.c,v 1.15 2009/10/27 23:59:38 deraadt Exp $	*/
+/*	$OpenBSD: head.c,v 1.16 2013/11/26 13:21:17 deraadt Exp $	*/
 
 /*
  * Copyright (c) 1980, 1987 Regents of the University of California.
@@ -54,7 +54,8 @@
 	char	*p = NULL;
 
 	/* handle obsolete -number syntax */
-	if (argc > 1 && argv[1][0] == '-' && isdigit(argv[1][1])) {
+	if (argc > 1 && argv[1][0] == '-' &&
+	    isdigit((unsigned char)argv[1][1])) {
 		p = argv[1] + 1;
 		argc--;
 		argv++;