Strict warnings in render() functions

Hi, I recently moved to PHP 5.3.6 and Search API is giving me Strict warnings. Such as:

Strict warning: Only variables should be passed by reference in theme_search_api_page_results() 

In search_api_page.pages.inc, change:

$output .= render(entity_view($index->entity_type, $entities, $variables['view_mode']));

To:

$render = entity_view($index->entity_type, $entities, $variables['view_mode']);
$output .= render($render);

Not sure if this is the correct approach to solve.