Remove […] from RSS feed?

Question

I would like to remove the [...] from the RSS feed widget.

I have tried adding the following to functions:

function replace_ellipsis($text) {

$return = str_replace('[...]', '-', $text);
 return $return;
}
add_filter('get_the_excerpt', 'replace_ellipsis');

However, this does not affect the widget.

Any help?