diff --git a/source4/scripting/python/samba/tests/__init__.py b/source4/scripting/python/samba/tests/__init__.py
index 58e41309980..ce2572fe8b3 100644
--- a/source4/scripting/python/samba/tests/__init__.py
+++ b/source4/scripting/python/samba/tests/__init__.py
@@ -28,6 +28,8 @@ from samba.samdb import SamDB
 import subprocess
 import tempfile
 
+samba.ensure_external_module("testtools", "testtools")
+
 # Other modules import these two classes from here, for convenience:
 from testtools.testcase import (
     TestCase as TesttoolsTestCase,