header expire on javascript files not working

I can't get the expire header on JS files to work properly.. It works fine on eg CSS files!?

Could anybody tell me what Im doing wrong? :(

htaccess

ExpiresActive on
ExpiresDefault A0
ExpiresByType image/gif A29030400
ExpiresByType image/jpeg A29030400
ExpiresByType image/png A29030400
ExpiresByType text/css A29030400
ExpiresByType text/javascript A29030400
ExpiresByType application/x-javascript A29030400

header on CSS file

Cache-Control   max-age=29030400
Connection  Keep-Alive
Date    Sun, 14 Oct 2012 12:06:45 GMT
Etag    "be-4cbcf2ad48b40"
Expires Sun, 15 Sep 2013 12:06:45 GMT
Keep-Alive  timeout=5, max=97
Server  Apache/2.4.2 (Win64) PHP/5.4.3

header on JS file

Cache-Control   max-age=0
Connection  Keep-Alive
Date    Sun, 14 Oct 2012 12:06:45 GMT
Etag    "1ad-4cc00d069f493"
Expires Sun, 14 Oct 2012 12:06:45 GMT
Keep-Alive  timeout=5, max=99
Server  Apache/2.4.2 (Win64) PHP/5.4.3

Solution

Try wrapping an ExpiresDefault in a <filesMatch tag instead of using ExpiresByType :

<filesMatch "\.(js)$"> 
    ExpiresDefault A29030400 
</filesMatch>