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-rw-r--r--src/nvim/ex_cmds.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/nvim/ex_cmds.c b/src/nvim/ex_cmds.c
index 6fa3f1b427..9bb77ce928 100644
--- a/src/nvim/ex_cmds.c
+++ b/src/nvim/ex_cmds.c
@@ -4142,6 +4142,7 @@ static int do_sub(exarg_T *eap, proftime_T timeout, long cmdpreview_ns, handle_T
// That is Vi compatible.
for (p1 = new_end; *p1; p1++) {
if (p1[0] == '\\' && p1[1] != NUL) { // remove backslash
+ sublen--; // correct the byte counts for extmark_splice()
STRMOVE(p1, p1 + 1);
} else if (*p1 == CAR) {
if (u_inssub(lnum) == OK) { // prepare for undo