diff --git a/pear/System.php b/pear/System.php
index d3c56d0697b..939692b8a7d 100644
--- a/pear/System.php
+++ b/pear/System.php
@@ -339,6 +339,9 @@ class System extends PEAR
             if (isset($_ENV['TMP'])) {
                 return $_ENV['TMP'];
             }
+            if (isset($_ENV['windir'])) {
+                return $_ENV['windir'] . '\temp';
+            }
             return $_ENV['SystemRoot'] . '\temp';
         }
         if (isset($_ENV['TMPDIR'])) {