diff --git a/lib/chartd/chart.rb b/lib/chartd/chart.rb
index f9c0e2d..e96835e 100644
--- a/lib/chartd/chart.rb
+++ b/lib/chartd/chart.rb
@@ -2,7 +2,7 @@
 require 'uri'
 
 class Chartd
-  BASE_URL = URI.parse('https://chartd.co/a.png')
+  BASE_URL = URI.parse('https://www.chartd.co/a.png')
 
   class Chart
     ERR_BAD_DATASET = 'Dataset has to be an array of Fixnums and/or Floats.'.freeze