diff --git a/lib/trackplot/engine.rb b/lib/trackplot/engine.rb
index 0bee3e4..87e759e 100644
--- a/lib/trackplot/engine.rb
+++ b/lib/trackplot/engine.rb
@@ -3,6 +3,7 @@ class Engine < ::Rails::Engine
     isolate_namespace Trackplot
 
     initializer "trackplot.helpers" do
+      require_relative "../../app/helpers/trackplot/chart_helper"
       ActiveSupport.on_load(:action_view) do
         include Trackplot::ChartHelper
       end