How to prevent natural signs from being printed when the key signature changes

[Jayaratna]

Dear Lilyfriends,
I am following the steps from the notation manual at this location:
http://lilypond.org/doc/v2.18/Documentation/notation/displaying-pitches#key-signature
My code is:

\version "2.18.2"
\score { 
\relative c'  {
\key f \major c d e f 
\set Staff.printKeyCancellation = ##f
\clef soprano \key c \major g a g f 
                  }
}

But I still get the natural sign printed.
<http://lilypond.1069038.n5.nabble.com/file/n168456/2014-11-06-170533_1024x600_scrot.png>
 
Am I doing something wrong or is this a bug?
Thank you,
A






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