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(function(H) {
  H.wrap(H.Legend.prototype, 'positionCheckboxes', function(p, scrollOffset) {
    var alignAttr = this.group.alignAttr,
      translateY,
      clipHeight = this.clipHeight || this.legendHeight;

    if (alignAttr) {
      translateY = alignAttr.translateY;
      H.each(this.allItems, function(item) {
        var checkbox = item.checkbox,
          bBox = item.legendItem.getBBox(true),
          top;

        if (checkbox) {
          top = (translateY + checkbox.y + (scrollOffset || 0) + 2);
          H.css(checkbox, {
            left: (alignAttr.translateX + item.checkboxOffset + checkbox.x - 100 - bBox.width) + 'px',
            top: top + 'px',
            display: top > translateY - 6 && top < translateY + clipHeight - 6 ? '' : 'none'
          });
        }
      });
    }
  });
})(Highcharts);