RSS feeds: relative path for inserted images

For some reason the source of inserted images gets a relative path. Which leads to the images not being loaded if the feed is consulted from outside the confluence pages.
The example below is a feed of a blog post with an inserted image:

<summary type="html"><div class="feed"> <p>
Blog post
<b>edited</b> by
<a href="http://foo.bar.com/display/~RSSFEED">rss receptie</a>
</p>
<div style="border-top: 1px solid #ddd; border-bottom: 1px solid #ddd; padding: 10px;">
<p><span class="image-wrap" style=""><img src="/download/attachments/9930922/foobar.jpg?version=1&amp;modificationDate=1345708056364" style="border: 1px solid black" /></span><br/>
test</p>
</div>
<div style="padding: 10px 0;">
<a href="http://foo.bar.com/display/TEST/2012/08/23/Test">View Online</a>

<a href="http://foo.bar.com/display/TEST/2012/08/23/Test?showComments=true&showCommentArea=true#addcomment">Add Comment</a>
</div>
</div></summary>