diff --git a/classes/woocommerce.class.php b/classes/woocommerce.class.php
index 8d8a0bd5c64..ecd660e7615 100644
--- a/classes/woocommerce.class.php
+++ b/classes/woocommerce.class.php
@@ -168,8 +168,14 @@ class woocommerce {
 		 * @return  location
 		 */
 		function redirect( $location, $status ) {
+			global $is_IIS;
+
+			// IIS fix
+			if ($is_IIS) session_write_close();
+		
 			$_SESSION['errors'] = $this->errors;
 			$_SESSION['messages'] = $this->messages;
+			
 			return $location;
 		}