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-rw-r--r--src/cmds.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/cmds.c b/src/cmds.c
index c342cd88bd8..9f96f210b9f 100644
--- a/src/cmds.c
+++ b/src/cmds.c
@@ -389,7 +389,7 @@ internal_self_insert (int c, EMACS_INT n)
/* We will delete too many columns. Let's fill columns
by spaces so that the remaining text won't move. */
ptrdiff_t actual = PT_BYTE;
- DEC_POS (actual);
+ actual -= prev_char_len (actual);
if (FETCH_CHAR (actual) == '\t')
/* Rather than add spaces, let's just keep the tab. */
chars_to_delete--;