diff --git a/lib/jekyll/converters/markdown/redcarpet_parser.rb b/lib/jekyll/converters/markdown/redcarpet_parser.rb
index d43eb140a..df18327b9 100644
--- a/lib/jekyll/converters/markdown/redcarpet_parser.rb
+++ b/lib/jekyll/converters/markdown/redcarpet_parser.rb
@@ -6,7 +6,7 @@ module Jekyll
         module CommonMethods
           def add_code_tags(code, lang)
             code = code.to_s
-            code = code.sub(/<pre>/, "<pre><code class=\"#{lang} language-#{lang}\" data-lang=\"#{lang}\">")
+            code = code.sub(/<pre>/, "<pre><code class=\"language-#{lang}\" data-lang=\"#{lang}\">")
             code = code.sub(/<\/pre>/,"</code></pre>")
           end
         end
diff --git a/test/test_redcarpet.rb b/test/test_redcarpet.rb
index dabcd62cd..ebf3b187f 100644
--- a/test/test_redcarpet.rb
+++ b/test/test_redcarpet.rb
@@ -32,7 +32,7 @@ class TestRedcarpet < Test::Unit::TestCase
       end
 
       should "render fenced code blocks with syntax highlighting" do
-        assert_equal "<div class=\"highlight\"><pre><code class=\"ruby language-ruby\" data-lang=\"ruby\"><span class=\"nb\">puts</span> <span class=\"s2\">&quot;Hello world&quot;</span>\n</code></pre></div>", @markdown.convert(
+        assert_equal "<div class=\"highlight\"><pre><code class=\"language-ruby\" data-lang=\"ruby\"><span class=\"nb\">puts</span> <span class=\"s2\">&quot;Hello world&quot;</span>\n</code></pre></div>", @markdown.convert(
           <<-EOS
 ```ruby
 puts "Hello world"
@@ -48,7 +48,7 @@ puts "Hello world"
       end
 
       should "render fenced code blocks with syntax highlighting" do
-        assert_equal "<div class=\"highlight\"><pre><code class=\"ruby language-ruby\" data-lang=\"ruby\"><span class=\"nb\">puts</span> <span class=\"s2\">\"Hello world\"</span>\n</code></pre></div>", @markdown.convert(
+        assert_equal "<div class=\"highlight\"><pre><code class=\"language-ruby\" data-lang=\"ruby\"><span class=\"nb\">puts</span> <span class=\"s2\">\"Hello world\"</span>\n</code></pre></div>", @markdown.convert(
           <<-EOS
 ```ruby
 puts "Hello world"
@@ -64,7 +64,7 @@ puts "Hello world"
       end
 
       should "render fenced code blocks without syntax highlighting" do
-        assert_equal "<div class=\"highlight\"><pre><code class=\"ruby language-ruby\" data-lang=\"ruby\">puts &quot;Hello world&quot;\n</code></pre></div>", @markdown.convert(
+        assert_equal "<div class=\"highlight\"><pre><code class=\"language-ruby\" data-lang=\"ruby\">puts &quot;Hello world&quot;\n</code></pre></div>", @markdown.convert(
           <<-EOS
 ```ruby
 puts "Hello world"