Query custom field on custom post

Hi there,

I'm trying to retrieve a set of 'custom_type' posts with a 'custom_field' condition. I'm not using a custom table in this case. This is the code I'm using.

    $args = array(
        'post_type' => 'custom_type',
        'posts_per_page' => -1,
        'meta_query' => array(
            array(
                'key' => 'custom_field',
                'value' => $value,
            ),
        ),
    );
    $query = new WP_Query( $args );

But the query is returning an empty set. Could you please help me to fix this?

Thanks!