(decode_coding): Fix handling of invalid bytes.

1 files changed, 3 insertions, 1 deletions

diff --git a/src/coding.c b/src/coding.c
index 15130b90719..1a9b13fd10e 100644
--- a/src/coding.c
+++ b/src/coding.c
@@ -6208,7 +6208,9 @@ decode_coding (coding)
             {
               int c = *src++;
 
-              coding->charbuf[coding->charbuf_used++] = (c & 0x80 ? - c : c);
+              if (c & 0x80)
+                c = BYTE8_TO_CHAR (c);
+              coding->charbuf[coding->charbuf_used++] = c;
             }
           produce_chars (coding, Qnil, 1);
         }