diff --git a/wp-includes/pluggable.php b/wp-includes/pluggable.php
index ef2821fb2a..d5a680737b 100644
--- a/wp-includes/pluggable.php
+++ b/wp-includes/pluggable.php
@@ -608,13 +608,15 @@ function wp_validate_auth_cookie($cookie = '', $scheme = '') {
 		return false;
 	}
 
-	extract($cookie_elements, EXTR_OVERWRITE);
-
-	$expired = $expiration;
+	$scheme = $cookie_elements['scheme'];
+	$username = $cookie_elements['username'];
+	$hmac = $cookie_elements['hmac'];
+	$expired = $expiration = $cookie_elements['expiration'];
 
 	// Allow a grace period for POST and AJAX requests
-	if ( defined('DOING_AJAX') || 'POST' == $_SERVER['REQUEST_METHOD'] )
+	if ( defined('DOING_AJAX') || 'POST' == $_SERVER['REQUEST_METHOD'] ) {
 		$expired += HOUR_IN_SECONDS;
+	}
 
 	// Quick check to see if an honest cookie has expired
 	if ( $expired < time() ) {
@@ -659,8 +661,9 @@ function wp_validate_auth_cookie($cookie = '', $scheme = '') {
 		return false;
 	}
 
-	if ( $expiration < time() ) // AJAX/POST grace period set above
+	if ( $expiration < time() ) {// AJAX/POST grace period set above
 		$GLOBALS['login_grace_period'] = 1;
+	}
 
 	/**
 	 * Fires once an authentication cookie has been validated.