Prepared statement bind_param() count

[crobinson42]

What am i doing wrong?!

$user->getUserRegions($uid); 

function getUserRegions($uid){
        global $mysqli;
        
        $stmt=$mysqli->prepare("SELECT user_region.default, company_region.name FROM user_region, company_region WHERE user_region.region=company_region.id AND user_region.user=?");
        $stmt->bind_param($uid);
        $stmt->execute();
        $stmt->bind_result($rdef,$rname);
        while($stmt->fetch()){
            echo $rname.'<br>';
        }
        $stmt->close();
    } 

Warning: Wrong parameter count for mysqli_stmt::bind_param()

This is killing me! any help is appreciated.