1 files changed, 1 insertions, 1 deletions

diff --git a/src/fileio.c b/src/fileio.c
index 3b1513600e2..e24dca08306 100644
--- a/src/fileio.c
+++ b/src/fileio.c
@@ -2681,7 +2681,7 @@ and (2) it puts less data in the undo list.")
       /* Arrange to read only the nonmatching middle part of the file.  */
       XFASTINT (beg) = same_at_start - BEGV;
       XFASTINT (end) = st.st_size - (ZV - same_at_end);
-      del_range_1 (same_at_start, same_at_end - same_at_start, 0);
+      del_range_1 (same_at_start, same_at_end, 0);
       /* Insert from the file at the proper position.  */
       SET_PT (same_at_start);
     }