diff --git a/middleman-more/features/helpers_form_tag.feature b/middleman-more/features/helpers_form_tag.feature
new file mode 100644
index 00000000..643ca18a
--- /dev/null
+++ b/middleman-more/features/helpers_form_tag.feature
@@ -0,0 +1,26 @@
+Feature: form_tag helper
+
+  Scenario: form_tag produces relative links
+    Given a fixture app "indexable-app"
+    And an empty file named "config.rb"
+    And a file named "source/form_tag.html.erb" with:
+    """
+    absolute: <% form_tag "/needs_index.html#absolute", :relative => true do %>
+    <% end %>
+    relative: <% form_tag "needs_index.html#relative", :relative => true do %>
+    <% end %>
+    """
+    And a file named "source/form_tag/sub.html.erb" with:
+    """
+    absolute: <% form_tag "/needs_index.html#absolute", :relative => true do %>
+    <% end %>
+    relative: <% form_tag "../needs_index.html#relative", :relative => true do %>
+    <% end %>
+    """
+    And the Server is running at "indexable-app"
+    When I go to "/form_tag.html"
+    Then I should see 'action="needs_index.html#absolute"'
+    Then I should see 'action="needs_index.html#relative"'
+    When I go to "/form_tag/sub.html"
+    Then I should see 'action="../needs_index.html#absolute"'
+    Then I should see 'action="../needs_index.html#relative"'
diff --git a/middleman-more/lib/middleman-more/core_extensions/default_helpers.rb b/middleman-more/lib/middleman-more/core_extensions/default_helpers.rb
index 6ecedcf0..e980b922 100644
--- a/middleman-more/lib/middleman-more/core_extensions/default_helpers.rb
+++ b/middleman-more/lib/middleman-more/core_extensions/default_helpers.rb
@@ -203,6 +203,13 @@ module Middleman
             
           super(*args, &block)
         end
+
+        # Modified Padrino form_for that uses Middleman's url_for
+        # to transform the URL.
+        def form_tag(url, options={}, &block)
+          url = url_for(url, options)
+          super
+        end
       end
     end
   end