Direct link to app-store application in iOS 7

Direct link to app-store application in iOS 7

I have a free version of app. And there is a link to a full version in
free app. The link works fine in iOS 6. But in iOS 7 it shows a blank
page. Any help is appreciated!
The link I use:
- (void) getFull
{
[self hideAnimated];
NSString *iTunesLink =
@"http://phobos.apple.com/WebObjects/MZStore.woa/wa/viewSoftware?id=604760686&mt=8";
[[UIApplication sharedApplication] openURL:[NSURL
URLWithString:iTunesLink]];
}