diff --git a/src/testdir/test_diffmode.vim b/src/testdir/test_diffmode.vim
index 08ec71b..e8bd087 100644
--- a/src/testdir/test_diffmode.vim
+++ b/src/testdir/test_diffmode.vim
@@ -1013,6 +1013,9 @@
   call term_sendkeys(buf, "ax\<Esc>")
   call VerifyScreenDump(buf, 'Test_diff_scroll_change_02', {})
 
+  call term_sendkeys(buf, "\<C-W>lay\<Esc>")
+  call VerifyScreenDump(buf, 'Test_diff_scroll_change_03', {})
+
   " clean up
   call StopVimInTerminal(buf)
   call delete('Xtest_scroll_change')