diff --git a/wp-admin/includes/misc.php b/wp-admin/includes/misc.php
index 225798f2ff..973071279d 100644
--- a/wp-admin/includes/misc.php
+++ b/wp-admin/includes/misc.php
@@ -155,7 +155,7 @@ function iis7_save_url_rewrite_rules(){
 	$web_config_file = $home_path . 'web.config';
 
 	// Using win_is_writable() instead of is_writable() because of a bug in Windows PHP
-	if ( iis7_supports_permalinks() && ( ! file_exists($web_config_file) && win_is_writable($home_path) && $wp_rewrite->using_mod_rewrite_permalinks() ) || win_is_writable($web_config_file) ) {
+	if ( iis7_supports_permalinks() && ( ( ! file_exists($web_config_file) && win_is_writable($home_path) && $wp_rewrite->using_mod_rewrite_permalinks() ) || win_is_writable($web_config_file) ) ) {
 		$rule = $wp_rewrite->iis7_url_rewrite_rules(false, '', '');
 		if ( ! empty($rule) ) {
 			return iis7_add_rewrite_rule($web_config_file, $rule);