1 files changed, 1 insertions, 0 deletions

diff --git a/src/cmds.c b/src/cmds.c
index 8a6fb19535c..9dfd2b48a8f 100644
--- a/src/cmds.c
+++ b/src/cmds.c
@@ -283,6 +283,7 @@ internal_self_insert (c1, noautofill)
       && (overwrite_binary_mode
           || FETCH_CHAR (point) != '\t'
           || XINT (current_buffer->tab_width) <= 0
+          || XFASTINT (current_buffer->tab_width) > 20
           || !((current_column () + 1) % XFASTINT (current_buffer->tab_width))))
     {
       del_range (point, point + 1);