diff --git a/wintest/test-s4-howto.py b/wintest/test-s4-howto.py
index 9d6c0617e60..e290b07732d 100755
--- a/wintest/test-s4-howto.py
+++ b/wintest/test-s4-howto.py
@@ -174,7 +174,7 @@ SafeModeAdminPassword=${PASSWORD1}
     child.expect("C:")
     child.expect("C:")
     child.sendline("dcpromo /answer:answers.txt")
-    i = child.expect(["You must restart this computer", "failed", "Active Directory Domain Services was not installed", "C:"], timeout=120)
+    i = child.expect(["You must restart this computer", "failed", "Active Directory Domain Services was not installed", "C:"], timeout=240)
     if i == 1 or i == 2:
         child.sendline("echo off")
         child.sendline("echo START DCPROMO log")