How to use geofield migrate extras
Using arguments is deprecated.

Now you can migrate geofields without migrate_extras.

$this-&gt;addFieldMapping('field_location', 'point');


And in your prepare row 

public function prepareRow($row) {
 $row-&gt;point = 'POINT (' . $row-&gt;longitude . ' ' . $row-&gt;latitude. ')';
}