Force http canonical tag on https pages

Some of my pages indexed by Google as https although I’ve setup my sitemap to http only. I need to prevent it and I think canonical could help me with this.

I’ve found a code from the stackoverflow. Will the code below help me and won’t cause issues with the AIO SEO Pack?

remove_action ( 'wp_head' , 'rel_canonical' ) ;
add_action ( 'wp_head' , 'my_rel_canonical' ) ;

function my_rel_canonical () {
    ob_start () ;
    rel_canonical () ;
    $rel_content = ob_get_contents () ;
    ob_end_clean () ;
    echo str_replace ( "https:" , "http:" , $rel_content ) ;
}

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