Set the offset manually.
$offset = ( get_query_var( 'page' ) ) ? get_query_var( 'page' ) : my_parse_url_for_offset();
function my_parse_url_for_offset() {
if( strpos( $_SERVER['REQUEST_URI'], '/page/' ) !== false ) {
$url = explode( "https://wordpress.stackexchange.com/", $_SERVER['REQUEST_URI'] );
$url_c = count( $url );
for( $i = 0; $i < $url_c; $i++ ) {
if( $url[$i] == 'page' ) {
if( is_numeric( $url[$i+1] ) )
$page = $url[$i+1];
}
}
} else {
$page = 1;
}
return $page;
}
then feed it as an arg in get_posts()