Call to Action button in new tab or window

Is it possible to have the call to action button opened in a new tab or window?

I tried to add target="blank" in this line in extra.php in the function of the call to action code:

echo '<a class="btn btn-lg cfa-button" href="'. of_get_option('w2f_cfa_link'). '" target="_blank">'. of_get_option('w2f_cfa_button'). '</a>';

but is doesn’t work? The link still opens in the same window.

Any suggestions?