diff --git a/bin/fontello b/bin/fontello
index e679a0e..b3aba21 100755
--- a/bin/fontello
+++ b/bin/fontello
@@ -19,7 +19,9 @@ def set_options_based_on_rails_root(options)
     zip_file: "#{options[:rails_root_dir]}/tmp/fontello.zip",
     config_file: "#{options[:asset_dir]}/fonts/config.json",
     fontello_session_id_file: "#{options[:rails_root_dir]}/tmp/fontello_session_id",
-    options_file: "#{options[:rails_root_dir]}/config/fontello_rails_converter.yml"
+    options_file: "#{options[:rails_root_dir]}/config/fontello_rails_converter.yml",
+    assets_prefix_css: "/assets",
+    assets_prefix_fonts: "/assets"
   })
 end
 
diff --git a/lib/fontello_rails_converter/cli.rb b/lib/fontello_rails_converter/cli.rb
index 56b2b42..cdb297f 100644
--- a/lib/fontello_rails_converter/cli.rb
+++ b/lib/fontello_rails_converter/cli.rb
@@ -160,14 +160,14 @@ def copy_icon_guide(zipfile, demo_file)
       def convert_icon_guide
         content = File.read(icon_guide_target_file)
         File.open(icon_guide_target_file, 'w') do |f|
-          f.write self.class.convert_icon_guide_html(content)
+          f.write convert_icon_guide_html(content)
         end
         puts green("Converted demo.html for asset pipeline: #{icon_guide_target_file}")
       end
 
-      def self.convert_icon_guide_html(content)
-        content.gsub! /css\//, "/assets/"
-        content.gsub! "url('./font/", "url('/assets/"
+      def convert_icon_guide_html(content)
+        content.gsub! /css\//, "#{@options[:assets_prefix_css]}/"
+        content.gsub! "url('./font\/", "url('#{@options[:assets_prefix_fonts]}/"
       end
 
       def config_file_exists?
diff --git a/spec/cli_spec.rb b/spec/cli_spec.rb
index 2db87fe..65a0d96 100644
--- a/spec/cli_spec.rb
+++ b/spec/cli_spec.rb
@@ -1,18 +1,23 @@
 require 'spec_helper'
 
 describe FontelloRailsConverter::Cli do
-  let(:cli) { described_class.new({
-      config_file: 'spec/fixtures/fontello/config.json',
-      stylesheet_dir: 'vendor/assets/stylesheets'
-    })
+  let(:options) {{
+    config_file: 'spec/fixtures/fontello/config.json',
+    stylesheet_dir: 'vendor/assets/stylesheets'
+  }}
+  let(:cli) { described_class.new(options)
   }
 
-  describe '.convert_icon_guide_html' do
+  describe '#convert_icon_guide_html' do
     let(:content) { File.read('spec/fixtures/fontello-demo.html') }
     let(:converted_content) { File.read('spec/fixtures/converted/fontello-demo.html') }
+    let(:options){{
+      assets_prefix_css: '/assets',
+      assets_prefix_fonts: '/assets'
+    }}
 
     specify do
-      expect(described_class.convert_icon_guide_html(content)).to eql converted_content
+      expect(cli.send(:convert_icon_guide_html, content)).to eql converted_content
     end
   end