===================================================================
RCS file: /cvsrepo/anoncvs/cvs/src/usr.bin/lam/lam.c,v
retrieving revision 1.15
retrieving revision 1.16
diff -u -r1.15 -r1.16
--- src/usr.bin/lam/lam.c	2013/11/15 22:20:04	1.15
+++ src/usr.bin/lam/lam.c	2013/11/20 21:22:17	1.16
@@ -1,4 +1,4 @@
-/*	$OpenBSD: lam.c,v 1.15 2013/11/15 22:20:04 millert Exp $	*/
+/*	$OpenBSD: lam.c,v 1.16 2013/11/20 21:22:17 deraadt Exp $	*/
 /*	$NetBSD: lam.c,v 1.2 1994/11/14 20:27:42 jtc Exp $	*/
 
 /*-
@@ -110,7 +110,8 @@
 			F = (ch == 'F');
 			/* Validate format string argument. */
 			for (p = optarg; *p != '\0'; p++)
-				if (!isdigit(*p) && *p != '.' && *p != '-')
+				if (!isdigit((unsigned char)*p) &&
+				    *p != '.' && *p != '-')
 					errx(1, "%s: invalid width specified",
 					     optarg);
 			/* '%' + width + 's' + '\0' */