functions.php

<?php

	function test_prevent_redirect( $redirect_url ) {
		if ( is_single() && in_array( get_post_type( get_the_ID() ), array( 'cursos', 'videos', 'disciplinas' ) ) ) $redirect_url = false;
		return $redirect_url;
	}
	
	add_filter('redirect_canonical',	'test_prevent_redirect' );