1 files changed, 4 insertions, 4 deletions

diff --git a/openbsd-compat/readpassphrase.c b/openbsd-compat/readpassphrase.c
index 82a0b7239..c99b4e20c 100644
--- a/openbsd-compat/readpassphrase.c
+++ b/openbsd-compat/readpassphrase.c
@@ -1,4 +1,4 @@
-/*      $OpenBSD: readpassphrase.c,v 1.23 2010/05/14 13:30:34 millert Exp $     */
+/*      $OpenBSD: readpassphrase.c,v 1.24 2013/11/24 23:51:29 deraadt Exp $     */
 
 /*
  * Copyright (c) 2000-2002, 2007, 2010
@@ -141,11 +141,11 @@ restart:
                 if (p < end) {
                         if ((flags & RPP_SEVENBIT))
                                 ch &= 0x7f;
-                        if (isalpha(ch)) {
+                        if (isalpha((unsigned char)ch)) {
                                 if ((flags & RPP_FORCELOWER))
-                                        ch = (char)tolower(ch);
+                                        ch = (char)tolower((unsigned char)ch);
                                 if ((flags & RPP_FORCEUPPER))
-                                        ch = (char)toupper(ch);
+                                        ch = (char)toupper((unsigned char)ch);
                         }
                         *p++ = ch;
                 }