2 files changed, 2 insertions, 2 deletions
diff --git a/gnupgparse.c b/gnupgparse.c
index a7263b83..8b7bf4c3 100644
--- a/gnupgparse.c
+++ b/gnupgparse.c
@@ -77,7 +77,7 @@ static void fix_uid (char *uid)
 
   for (s = d = uid; *s;)
   {
-    if (*s == '\\' && *(s+1) == 'x' && isxdigit (*(s+2)) && isxdigit (*(s+3)))
+    if (*s == '\\' && *(s+1) == 'x' && isxdigit ((unsigned char) *(s+2)) && isxdigit ((unsigned char) *(s+3)))
     {
       *d++ = hexval (*(s+2)) << 4 | hexval (*(s+3));
       s += 4;
diff --git a/pgpkey.c b/pgpkey.c
index 24d66d6f..ab405ee7 100644
--- a/pgpkey.c
+++ b/pgpkey.c
@@ -137,7 +137,7 @@ static const char *pgp_entry_fmt (char *dest,
   key   = uid->parent;
   pkey  = pgp_principal_key (key);
 
-  if (isupper (op))
+  if (isupper ((unsigned char) op))
     key = pkey;
 
   kflags = key->flags | (pkey->flags & KEYFLAG_RESTRICTIONS)