1 files changed, 1 insertions, 1 deletions
diff --git a/buffer.c b/buffer.c
index e66c6a4..64307ef 100644
--- a/buffer.c
+++ b/buffer.c
@@ -637,7 +637,7 @@ np (const char *str)
  */
 
 bool
-char_class (const char c, const unsigned int flags)
+char_class (const unsigned char c, const unsigned int flags)
 {
   if (!flags)
     return false;