generated code by the css validator for the icon not xhtml valid

Hello.
Something funny I guess i've juste realised :
My style-sheet is CSS valid according to 
http://jigsaw.w3.org/css-validator/
so, this is the code for the icon to place on my site :

<p>
 <a href="http://jigsaw.w3.org/css-validator/">
  <img style="border:0;width:88px;height:31px"
       src="http://jigsaw.w3.org/css-validator/images/vcss" 
       alt="Valid CSS!">
 </a>
</p>

but, once i've pasted this on my site, my web page is no longer XHTML 1.1 
valid because the <img> tag has no closing tag   :-)

Raphaël COHEN
DDT Systèmes d'Information
Tél : 01 78 40 89 22
r.cohen@ixis-am.com