1 files changed, 2 insertions, 1 deletions

diff --git a/src/buffer.c b/src/buffer.c
index fd53972d6b1..b9c5c2acc52 100644
--- a/src/buffer.c
+++ b/src/buffer.c
@@ -2161,8 +2161,9 @@ but the contents viewed as characters do change.  */)
           else
             {
               unsigned char tmp[MAX_MULTIBYTE_LENGTH];
+              int c = BYTE8_TO_CHAR (*p);
 
-              bytes = CHAR_STRING (*p, tmp);
+              bytes = CHAR_STRING (c, tmp);
               *p = tmp[0];
               TEMP_SET_PT_BOTH (pos + 1, pos + 1);
               bytes--;