diff --git a/wp-includes/comment.php b/wp-includes/comment.php
index 7d4abd75a9..516c1eb1b5 100644
--- a/wp-includes/comment.php
+++ b/wp-includes/comment.php
@@ -735,7 +735,7 @@ function wp_set_comment_cookies($comment, $user) {
 	 * @param int $seconds Comment cookie lifetime. Default 30000000.
 	 */
 	$comment_cookie_lifetime = apply_filters( 'comment_cookie_lifetime', 30000000 );
-	$secure = is_https_url( home_url() );
+	$secure = ( 'https' === parse_url( home_url(), PHP_URL_SCHEME ) );
 	setcookie( 'comment_author_' . COOKIEHASH, $comment->comment_author, time() + $comment_cookie_lifetime, COOKIEPATH, COOKIE_DOMAIN, $secure );
 	setcookie( 'comment_author_email_' . COOKIEHASH, $comment->comment_author_email, time() + $comment_cookie_lifetime, COOKIEPATH, COOKIE_DOMAIN, $secure );
 	setcookie( 'comment_author_url_' . COOKIEHASH, esc_url($comment->comment_author_url), time() + $comment_cookie_lifetime, COOKIEPATH, COOKIE_DOMAIN, $secure );
diff --git a/wp-includes/option.php b/wp-includes/option.php
index 1d2c35d41f..77c95fdc1f 100644
--- a/wp-includes/option.php
+++ b/wp-includes/option.php
@@ -746,7 +746,7 @@ function wp_user_settings() {
 	}
 
 	// The cookie is not set in the current browser or the saved value is newer.
-	$secure = is_https_url( site_url() );
+	$secure = ( 'https' === parse_url( site_url(), PHP_URL_SCHEME ) );
 	setcookie( 'wp-settings-' . $user_id, $settings, time() + YEAR_IN_SECONDS, SITECOOKIEPATH, COOKIE_DOMAIN, $secure );
 	setcookie( 'wp-settings-time-' . $user_id, time(), time() + YEAR_IN_SECONDS, SITECOOKIEPATH, COOKIE_DOMAIN, $secure );
 	$_COOKIE['wp-settings-' . $user_id] = $settings;
diff --git a/wp-login.php b/wp-login.php
index 911d41b044..803708222d 100644
--- a/wp-login.php
+++ b/wp-login.php
@@ -427,7 +427,7 @@ if ( defined( 'RELOCATE' ) && RELOCATE ) { // Move flag is set
 }
 
 //Set a cookie now to see if they are supported by the browser.
-$secure = ( is_https_url( home_url() ) && is_https_url( site_url() ) );
+$secure = ( 'https' === parse_url( site_url(), PHP_URL_SCHEME ) && 'https' === parse_url( home_url(), PHP_URL_SCHEME ) );
 setcookie( TEST_COOKIE, 'WP Cookie check', 0, COOKIEPATH, COOKIE_DOMAIN, $secure );
 if ( SITECOOKIEPATH != COOKIEPATH )
 	setcookie( TEST_COOKIE, 'WP Cookie check', 0, SITECOOKIEPATH, COOKIE_DOMAIN, $secure );
@@ -469,7 +469,7 @@ case 'postpass' :
 	 * @param int $expires The expiry time, as passed to setcookie().
 	 */
 	$expire = apply_filters( 'post_password_expires', time() + 10 * DAY_IN_SECONDS );
-	$secure = is_https_url( home_url() );
+	$secure = ( 'https' === parse_url( home_url(), PHP_URL_SCHEME ) );
 	setcookie( 'wp-postpass_' . COOKIEHASH, $hasher->HashPassword( wp_unslash( $_POST['post_password'] ) ), $expire, COOKIEPATH, COOKIE_DOMAIN, $secure );
 
 	wp_safe_redirect( wp_get_referer() );