diff --git a/src/testdir/test_ex_mode.vim b/src/testdir/test_ex_mode.vim
index 7031115..2642a16 100644
--- a/src/testdir/test_ex_mode.vim
+++ b/src/testdir/test_ex_mode.vim
@@ -241,4 +241,14 @@
   call delete('Xexmodescript')
 endfunc
 
+func Test_ex_mode_large_indent()
+  new
+  set ts=500 ai
+  call setline(1, "\t")
+  exe "normal gQi\<CR>."
+  set ts=8 noai
+  bwipe!
+endfunc
+
+
 " vim: shiftwidth=2 sts=2 expandtab