diff --git a/lib/chart/axis.ex b/lib/chart/axis.ex
index 615fff7..0883e53 100644
--- a/lib/chart/axis.ex
+++ b/lib/chart/axis.ex
@@ -131,6 +131,17 @@ defmodule Contex.Axis do
     ]
   end
 
+  @doc """
+  Draw the zero line for ensuring it's drawn even when zero
+  isn't aligned to the base of the graph.
+  """
+  def get_zero_line_svg(%Axis{scale: scale} = axis) do
+    # Check that scale intersects zero by looking at domain
+    # If so...
+   domain_to_range_fn = Scale.domain_to_range_fn(scale)
+   get_svg_gridline(axis, domain_to_range_fn.(0.0))
+  end
+
   defp get_svg_gridlines(%Axis{scale: scale} = axis) do
     domain_ticks = Scale.ticks_domain(scale)
     domain_to_range_fn = Scale.domain_to_range_fn(scale)
diff --git a/lib/chart/barchart.ex b/lib/chart/barchart.ex
index a9f2209..16668c5 100644
--- a/lib/chart/barchart.ex
+++ b/lib/chart/barchart.ex
@@ -357,9 +357,12 @@ defmodule Contex.BarChart do
 
     val_axis_svg = if plot_options.show_val_axis, do: Axis.to_svg(value_axis), else: ""
 
+    zero_line = Axis.get_zero_line_svg(category_axis)
+
     [
       cat_axis_svg,
       val_axis_svg,
+      zero_line,
       "<g>",
       get_svg_bars(plot),
       "</g>"
@@ -504,12 +507,12 @@ defmodule Contex.BarChart do
   end
 
   defp prepare_bar_values(series_values, scale, :grouped) do
-    {scale_min, _} = Scale.get_range(scale)
+    scale_zero = Scale.domain_to_range(scale, 0.0)
 
     results =
       Enum.reduce(series_values, [], fn data_val, points ->
         range_val = Scale.domain_to_range(scale, data_val)
-        [{scale_min, range_val} | points]
+        [{scale_zero, range_val} | points]
       end)
 
     Enum.reverse(results)