URL interpolation does not interpolate timestamp

lib/paperclip/interpolations.rb

@@ -43,7 +43,7 @@ module Paperclip
     # is used in the default :path to ease default specifications.
     def url attachment, style
       raise InfiniteInterpolationError if attachment.options[:url].include?(":url")
-      attachment.url(style)
+      attachment.url(style, false)
     end
 
     # Returns the timestamp as defined by the <attachment>_updated_at field

test/interpolations_test.rb

@@ -79,7 +79,7 @@ class InterpolationsTest < Test::Unit::TestCase
   should "reinterpolate :url" do
     attachment = mock
     attachment.expects(:options).returns({:url => ":id"})
-    attachment.expects(:url).with(:style).returns("1234")
+    attachment.expects(:url).with(:style, false).returns("1234")
     assert_equal "1234", Paperclip::Interpolations.url(attachment, :style)
   end