diff --git a/src/testdir/test_visual.vim b/src/testdir/test_visual.vim
index e40be5d..9ca0fa9 100644
--- a/src/testdir/test_visual.vim
+++ b/src/testdir/test_visual.vim
@@ -1278,6 +1278,15 @@
   au! BufNew
 endfunc
 
+func Test_visual_block_append_invalid_char()
+  " this was going over the end of the line
+  new
+  call setline(1, ['	   let xxx', 'xxxxx', 'xxxxxxxxxxx'])
+  exe "normal 0\<C-V>jjA-\<Esc>"
+  call assert_equal(['	-   let xxx', 'xxxxx   -', 'xxxxxxxx-xxx'], getline(1, 3))
+  bwipe!
+endfunc
+
 func Test_visual_reselect_with_count()
   " this was causing an illegal memory access
   let lines =<< trim END