diff --git a/demo/moulinrouge/tests.py b/demo/moulinrouge/tests.py
index 5add791..3bc6d0c 100644
--- a/demo/moulinrouge/tests.py
+++ b/demo/moulinrouge/tests.py
@@ -354,12 +354,12 @@ def get_test_routes(app):
 
     @app.route('/test/bar/position')
     def test_bar_print_values_position():
-        bar = StackedBar(print_values=True, print_values_position='top', range=(0, 10),
+        bar = StackedBar(print_values=True, print_values_position='top', zero=2,
                   style=styles['default'](
                       value_font_family='googlefont:Raleway',
                       value_font_size=46))
-        bar.add('1', [1, 3, 3])
-        bar.add('2', [4, 5, 6])
+        bar.add('1', [1, -2, 3])
+        bar.add('2', [4, -5, 6])
         bar.x_labels = [2, 4, 6]
         bar.x_labels_major = [4]
         return bar.render_response()