diff --git a/system/helpers/file_helper.php b/system/helpers/file_helper.php
index 0587740..ae3db58 100644
--- a/system/helpers/file_helper.php
+++ b/system/helpers/file_helper.php
@@ -298,8 +298,7 @@
 					$fileinfo['readable'] = is_readable($file);
 					break;
 				case 'writable':
-					// There are known problems using is_weritable on IIS.  It may not be reliable - consider fileperms()
-					$fileinfo['writable'] = is_writable($file);
+					$fileinfo['writable'] = is_really_writable($file);
 					break;
 				case 'executable':
 					$fileinfo['executable'] = is_executable($file);