diff --git a/actionpack/lib/action_view/helpers/tag_helper.rb b/actionpack/lib/action_view/helpers/tag_helper.rb
index eea797abb5a1c264c4b8891edf531fc076e03e91..ff5a2134ff82e442530771f893c57c21ebb97f1e 100644
--- a/actionpack/lib/action_view/helpers/tag_helper.rb
+++ b/actionpack/lib/action_view/helpers/tag_helper.rb
@@ -134,16 +134,14 @@ def content_tag_string(name, content, options, escape = true)
         def tag_options(options, escape = true)
           unless options.blank?
             attrs = []
-            if escape
-              options.each_pair do |key, value|
-                if BOOLEAN_ATTRIBUTES.include?(key)
-                  attrs << %(#{key}="#{key}") if value
-                else
-                  attrs << %(#{key}="#{escape_once(value)}") if !value.nil?
-                end
+            options.each_pair do |key, value|
+              if BOOLEAN_ATTRIBUTES.include?(key)
+                attrs << %(#{key}="#{key}") if value
+              elsif !value.nil?
+                final_value = value.is_a?(Array) ? value.join(" ") : value
+                final_value = escape_once(final_value) if escape
+                attrs << %(#{key}="#{final_value}")
               end
-            else
-              attrs = options.map { |key, value| %(#{key}="#{value}") }
             end
             " #{attrs.sort * ' '}" unless attrs.empty?
           end
diff --git a/actionpack/test/template/tag_helper_test.rb b/actionpack/test/template/tag_helper_test.rb
index ef88cae5b825aec638b3776e6f7babf06bcf2c07..2aa3d5b5fac91cb16105ea80230d63363ff5028f 100644
--- a/actionpack/test/template/tag_helper_test.rb
+++ b/actionpack/test/template/tag_helper_test.rb
@@ -71,6 +71,19 @@ def test_content_tag_nested_in_content_tag_in_erb
     assert_equal '<p><b>Hello</b></p>', output_buffer
   end
 
+  def test_content_tag_with_escaped_array_class
+    str = content_tag('p', "limelight", :class => ["song", "play>"])
+    assert_equal "<p class=\"song play&gt;\">limelight</p>", str
+
+    str = content_tag('p', "limelight", :class => ["song", "play"])
+    assert_equal "<p class=\"song play\">limelight</p>", str
+  end
+
+  def test_content_tag_with_unescaped_array_class
+    str = content_tag('p', "limelight", {:class => ["song", "play>"]}, false)
+    assert_equal "<p class=\"song play>\">limelight</p>", str
+  end
+
   def test_cdata_section
     assert_equal "<![CDATA[<hello world>]]>", cdata_section("<hello world>")
   end