diff --git a/test/library/gui.lua b/test/library/gui.lua
index 80c91198c..3fc8b889d 100644
--- a/test/library/gui.lua
+++ b/test/library/gui.lua
@@ -18,6 +18,7 @@ function test.clear_pen()
         bg = COLOR_BLACK,
         bold = false,
         tile_color = false,
+        write_to_lower = true,
     })
 end