John Conner on "[Plugin: Autoptimize] @font face"

Applied theme are Pinboard on WP 3.8.1 and Twenty Fourteen on WP 3.9
Added css code is:

@font-face {
    font-family: 'webfontname';
    src: url('/webfont.eot');
    src: url('/webfont.eot?#iefix') format('embedded-opentype'),
         url('/webfont.woff') format('woff'),
         url('/webfont.ttf') format('truetype'),
         url('/webfont.svg#webfontname') format('svg');
    font-weight: normal;
    font-style: normal;
}

I'm afraid, changing the mentioned line didn't help.