Overflow issue using CSS3 transition

I'm trying to do a small animation visible on the JsFiddle below.

But as you can see the border radius not work during the animation...

There is a fix for that?

http://jsfiddle.net/toroncino/V4V97/

Here is my code:

a {
    border-radius: 10px;
    display: inline-block;
    height: 300px;
    overflow: hidden;
}

a img {
    -moz-transition: all .5s ease-in-out;
    -o-transition: all .5s ease-in-out;
    -webkit-transition: all .5s ease-in-out;
    transition: all .5s ease-in-out;
    width: 100%;
    height: 100%;
}

a:hover img {
    -moz-transform: scale(1.1);
    -o-transform: scale(1.1);
    -webkit-transform: scale(1.1);
    transform: scale(1.1);
}