diff --git a/suites/voice/mo_mt_call_tchh.py b/suites/voice/mo_mt_call_tchh.py
index e6f6b98..43d0760 100755
--- a/suites/voice/mo_mt_call_tchh.py
+++ b/suites/voice/mo_mt_call_tchh.py
@@ -1,6 +1,8 @@
 #!/usr/bin/env python3
 from osmo_gsm_tester.testenv import *
 
+import testlib
+suite.test_import_modules_register_for_cleanup(testlib)
 from testlib import call_test_setup_run
 
 def my_bts_setup(bts):