diff --git a/install/steps/3-requirements.php b/install/steps/3-requirements.php
index bb25d230..b1c0092a 100644
--- a/install/steps/3-requirements.php
+++ b/install/steps/3-requirements.php
@@ -25,8 +25,8 @@ $failed = false;
 version_check($locale['step_requirements_php_version'], (PHP_VERSION_ID >= 50300), PHP_VERSION);
 foreach(array('images/guilds', 'images/houses', 'images/gallery') as $value)
 {
-	$perms = (int) substr(decoct(fileperms(BASE . $value)), 2);
-	version_check($locale['step_requirements_write_perms'] . ': ' . $value, $perms >= 660);
+	$is_writable = is_writable(BASE . $value);
+	version_check($locale['step_requirements_write_perms'] . ': ' . $value, $is_writable);
 }
 
 $ini_register_globals = ini_get_bool('register_globals');