diff --git a/middleman-core/lib/middleman-core/meta_pages/sitemap_resource.rb b/middleman-core/lib/middleman-core/meta_pages/sitemap_resource.rb
index 24112d99..85a9b2c0 100644
--- a/middleman-core/lib/middleman-core/meta_pages/sitemap_resource.rb
+++ b/middleman-core/lib/middleman-core/meta_pages/sitemap_resource.rb
@@ -1,5 +1,7 @@
-require 'vendored-middleman-deps/padrino-core-0.10.7/lib/padrino-core/support_lite'
-require 'vendored-middleman-deps/padrino-helpers-0.10.7/lib/padrino-helpers'
+if defined?(::Padrino::Helpers)
+  require 'vendored-middleman-deps/padrino-core-0.10.7/lib/padrino-core/support_lite'
+  require 'vendored-middleman-deps/padrino-helpers-0.10.7/lib/padrino-helpers'
+end
 
 module Middleman
   module MetaPages
diff --git a/middleman-core/lib/middleman-more/core_extensions/default_helpers.rb b/middleman-core/lib/middleman-more/core_extensions/default_helpers.rb
index f9069f68..670aa831 100644
--- a/middleman-core/lib/middleman-more/core_extensions/default_helpers.rb
+++ b/middleman-core/lib/middleman-more/core_extensions/default_helpers.rb
@@ -4,8 +4,11 @@ class Middleman::CoreExtensions::DefaultHelpers < ::Middleman::Extension
     super
 
     require 'active_support/core_ext/object/to_query'
-    require 'vendored-middleman-deps/padrino-core-0.10.7/lib/padrino-core/support_lite'
-    require 'vendored-middleman-deps/padrino-helpers-0.10.7/lib/padrino-helpers'
+
+    if defined?(::Padrino::Helpers)
+      require 'vendored-middleman-deps/padrino-core-0.10.7/lib/padrino-core/support_lite'
+      require 'vendored-middleman-deps/padrino-helpers-0.10.7/lib/padrino-helpers'
+    end
 
     app.helpers ::Padrino::Helpers::OutputHelpers
     app.helpers ::Padrino::Helpers::TagHelpers