1 files changed, 2 insertions, 1 deletions

diff --git a/src/coding.c b/src/coding.c
index 378f5d5de0a..e22581b2c03 100644
--- a/src/coding.c
+++ b/src/coding.c
@@ -1440,7 +1440,8 @@ encode_designation_at_bol (coding, table, src, src_end, dstp)
         charset = CHARSET_AT (src);
       else
         {
-          int c_alt, c1, c2;
+          int c_alt;
+          unsigned char c1, c2;
 
           SPLIT_STRING(src, bytes, charset, c1, c2);
           if ((c_alt = unify_char (table, -1, charset, c1, c2)) >= 0)