diff --git a/app/models/cost.rb b/app/models/cost.rb
index 74103ed..480f8de 100644
--- a/app/models/cost.rb
+++ b/app/models/cost.rb
@@ -105,7 +105,7 @@ class Cost
   def easy_energy_tariff_barplot(date)
     hours = (0..23).to_a
     costs = easy_energy_hours(date)
-    g = Gruff::StackedBar.new()
+    g = Gruff::Bar.new()
     g.title = "Tarief per kwH (incl. belastingen en BTW) - %s" % I18n.localize(date, format: "%A, %e %B %Y")
     g.x_axis_label = "uur"
     #g.y_axis_label = "EUR"
@@ -137,7 +137,7 @@ class Cost
     
     # create plot
     hours = (0..23).to_a
-    g = Gruff::StackedBar.new()
+    g = Gruff::Bar.new
     g.title = "Verbruikskosten (incl. belastingen en BTW) - %s" % I18n.localize(date, format: "%A, %e %B %Y")
     g.x_axis_label = "uur"
     #g.y_axis_label = "EUR"