diff --git a/lib/ruby2js/haml.rb b/lib/ruby2js/haml.rb
index 4b414737..325f42d5 100644
--- a/lib/ruby2js/haml.rb
+++ b/lib/ruby2js/haml.rb
@@ -15,13 +15,42 @@
 # (Note missing brackets: ruby syntax, js sematics)
 #
 require "haml"
+require "haml/filters"
+require "haml/filters/base"
+
+module Haml
+  class Filters
+    class Ruby2JS < Base
+      def compile(node)
+        temple = [:multi]
+        temple << [:static, "<script type='text/javascript'>\n"]
+        compile_ruby!( temple , node )
+        temple << [:static, "\n</script>"]
+        temple
+      end
+
+      #Copird from text base, added ruby2js convert
+      def compile_ruby!(temple, node)
+        text = node.value[:text]
+        if ::Haml::Util.contains_interpolation?(node.value[:text])
+          # original: Haml::Filters#compile
+          text = ::Haml::Util.unescape_interpolation(text).gsub(/(\\+)n/) do |s|
+            escapes = $1.size
+            next s if escapes % 2 == 0
+            "#{'\\' * (escapes - 1)}\n"
+          end
+          text.prepend("\n")
+
+          temple << [:dynamic, "::Ruby2JS.convert(#{text} ).to_s"]
+        else
+          temple << [:static, ::Ruby2JS.convert(text).to_s]
+        end
+      end
+
 
-module Ruby2JS
-  module Haml::Ruby2JS
-    include Haml::Filters::Base
-    def render(text)
-      converted = Ruby2JS.convert(text).to_s
-      "<script type='text/javascript'>\n#{converted}\n</script>"
     end
   end
 end
+
+
+Haml::Filters.registered[:ruby2js] ||= Haml::Filters::Ruby2JS
diff --git a/spec/haml_spec.rb b/spec/haml_spec.rb
index 168cbad9..4a18469c 100644
--- a/spec/haml_spec.rb
+++ b/spec/haml_spec.rb
@@ -1,21 +1,45 @@
+gem 'minitest'
+require 'minitest/autorun'
+require 'ruby2js/filter/functions'
+
 require 'haml'
 require 'ruby2js/haml'
 
 describe 'HAML filter' do
   it 'should convert ruby to javascript' do
-    template = %{
+    haml = %{
        :ruby2js
          alert 'Hello'
     }
 
     # unindent template so that the first line starts in column 1
-    template.gsub!(/^#{template[/\A\s+/]}/, '')
+    # As in, it is valid haml
+    haml.gsub!(/^#{haml[/\A\s+/]}/, '')
+
+    #copied from from haml tests, module RenderHelper
 
-    haml_engine = Haml::Engine.new(template)
-    output = _(haml_engine.render)
+    output = Haml::Template.new({}) { haml }.render(Object.new, {})
 
-    output.must_include "<script type='text/javascript'>"
-    output.must_include 'alert("Hello")'
-    output.must_include '</script>'
+    _(output).must_include "<script type='text/javascript'>"
+    _(output).must_include 'alert("Hello")'
+    _(output).must_include '</script>'
   end
+
+  it 'should convert ruby with interpolation to javascript' do
+    haml = %{
+       :ruby2js
+         alert HASH{2 + 2}
+    }
+
+    # unindent template so that the first line starts in column 1
+    # As in, it is valid haml
+    haml.gsub!(/^#{haml[/\A\s+/]}/, '')
+    haml.gsub!("HASH", "#") #stop ruby interpreteting the 2 + 2
+
+    #copied from from haml tests, module RenderHelper
+    output = Haml::Template.new({}) { haml }.render(Object.new, {})
+
+    _(output).must_include 'alert(4)'
+  end
+
 end