diff --git a/tests/mailfunc.php b/tests/mailfunc.php
index 5bf77b1df..92cfbb100 100644
--- a/tests/mailfunc.php
+++ b/tests/mailfunc.php
@@ -19,7 +19,7 @@ class rcube_test_mailfunc extends UnitTestCase
     $RCMAIL->imap_init(false);
     $IMAP = $RCMAIL->imap;
     
-    require_once 'steps/mail/func.inc';
+    require_once INSTALL_PATH . 'program/steps/mail/func.inc';
     
     $GLOBALS['EMAIL_ADDRESS_PATTERN'] = $EMAIL_ADDRESS_PATTERN;
   }