shouldOverrideUrlLoading() in Android WebViewClient not called when using setUserAgentString() on WebView

I have a Fragment with a WebView. I use a custom WebViewClient that I set to the WebView. I need to display web pages in desktop mode instead of the mobile version. But this seems to prevent my custom WebViewClient from being used. My code looks similar to this:

WebViewClient

public class MyWebViewClient extends WebViewClient 
{
    @Override
    public boolean shouldOverrideUrlLoading(WebView view, String url)
    {
        Log.d("Called URL", url.toString());

        return true;
    }
}

Fragment

public MyFragment extends Fragment
{
    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,Bundle savedInstanceState)
    {
        View rootView = inflater.inflate(R.layout.fragment_main, container, false);
        webView = (WebView) rootView.findViewById(R.id.webView);
        webView.getSettings().setJavaScriptEnabled(true);
        webView.setWebViewClient(new MyWebViewClient());

        // This seems to disable the usage of MyWebViewClient 
        webView.getSettings().setUserAgentString("Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.9.0.4) Gecko/20100101 Firefox/4.0");

        webView.addJavascriptInterface(this, "someView");
        return rootView;
    }
}