1 files changed, 1 insertions, 1 deletions

diff --git a/src/insdel.c b/src/insdel.c
index a3afd75b5c5..a53c937ab6f 100644
--- a/src/insdel.c
+++ b/src/insdel.c
@@ -944,7 +944,7 @@ insert_from_string_1 (string, pos, pos_byte, nchars, nbytes,
   /* Only defined if Emacs is compiled with USE_TEXT_PROPERTIES */
   offset_intervals (current_buffer, PT, nchars);
 
-  GAP_SIZE -= nbytes;
+  GAP_SIZE -= outgoing_nbytes;
   GPT += nchars;
   ZV += nchars;
   Z += nchars;