diff --git a/tests/compose/core/05_connectivity.py b/tests/compose/core/05_connectivity.py
index 44bb4553..0a180cda 100755
--- a/tests/compose/core/05_connectivity.py
+++ b/tests/compose/core/05_connectivity.py
@@ -119,7 +119,7 @@ def test_managesieve(server, username, password):
     except managesieve.MANAGESIEVE.abort:
         pass
 
-    m=managesieve.MANAGESIEVE(server, use_tls=True)
+    m=managesieve.MANAGESIEVE(server, use_tls=True, tls_verify=False)
     if m.login('', username, 'wrongpass') != 'NO':
         print(f'Authenticating to sieve://{username}:{password}@{server}:4190/ with wrong creds has worked!')
         sys.exit(108)