1 files changed, 1 insertions, 1 deletions

diff --git a/src/insdel.c b/src/insdel.c
index 39c76d03dfe..030b87385bd 100644
--- a/src/insdel.c
+++ b/src/insdel.c
@@ -707,7 +707,7 @@ copy_text (from_addr, to_addr, nbytes,
           c = STRING_CHAR_AND_LENGTH (from_addr, bytes_left, thislen);
           *to_addr++ = SINGLE_BYTE_CHAR_P (c) ? c : (c & 0177) + 0200;
           from_addr += thislen;
-          bytes_left--;
+          bytes_left -= thislen;
           nchars++;
         }
       return nchars;