diff --git a/actionpack/lib/sprockets/helpers/rails_helper.rb b/actionpack/lib/sprockets/helpers/rails_helper.rb
index 177f7f6747..976ae5a76d 100644
--- a/actionpack/lib/sprockets/helpers/rails_helper.rb
+++ b/actionpack/lib/sprockets/helpers/rails_helper.rb
@@ -69,12 +69,12 @@ module Sprockets
       alias_method :path_to_font, :font_path # aliased to avoid conflicts with an font_path named route
 
       def javascript_path(source)
-        path_to_asset(source)
+        path_to_asset(source, :ext => 'js')
       end
       alias_method :path_to_javascript, :javascript_path # aliased to avoid conflicts with an javascript_path named route
 
       def stylesheet_path(source)
-        path_to_asset(source)
+        path_to_asset(source, :ext => 'css')
       end
       alias_method :path_to_stylesheet, :stylesheet_path # aliased to avoid conflicts with an stylesheet_path named route
 
diff --git a/actionpack/test/template/sprockets_helper_test.rb b/actionpack/test/template/sprockets_helper_test.rb
index fb472cfbe5..1c591bdcc2 100644
--- a/actionpack/test/template/sprockets_helper_test.rb
+++ b/actionpack/test/template/sprockets_helper_test.rb
@@ -157,6 +157,9 @@ class SprocketsHelperTest < ActionView::TestCase
   end
 
   test "javascript_path" do
+    assert_match %r{/assets/application-[0-9a-f]+.js},
+      javascript_path("application")
+
     assert_match %r{/assets/application-[0-9a-f]+.js},
       javascript_path("application.js")
 
@@ -165,6 +168,9 @@ class SprocketsHelperTest < ActionView::TestCase
   end
 
   test "stylesheet_path" do
+    assert_match %r{/assets/application-[0-9a-f]+.css},
+      stylesheet_path("application")
+
     assert_match %r{/assets/application-[0-9a-f]+.css},
       stylesheet_path("application.css")