diff --git a/tests/system_test.py b/tests/system_test.py
index 1ed045b70..796db98c4 100755
--- a/tests/system_test.py
+++ b/tests/system_test.py
@@ -54,7 +54,7 @@
 from subprocess import PIPE, STDOUT, TimeoutExpired
 from threading import Event
 from threading import Thread
-from typing import Callable, TextIO, List, Optional, Tuple, Union, Type, Set, Any, TypeVar, Dict
+from typing import Callable, TextIO, List, Optional, Tuple, Type, Set, Any, TypeVar, Dict
 
 import __main__
 
diff --git a/tests/system_tests_http1_adaptor.py b/tests/system_tests_http1_adaptor.py
index 8b3aeec8d..f01486831 100644
--- a/tests/system_tests_http1_adaptor.py
+++ b/tests/system_tests_http1_adaptor.py
@@ -3253,6 +3253,7 @@ class Http1AdaptorConnCounter(TestCase):
     Validate the HTTP1 service connection counter
     """
     router: Qdrouterd
+
     @classmethod
     def setUpClass(cls):
         super(Http1AdaptorConnCounter, cls).setUpClass()
diff --git a/tests/system_tests_http2.py b/tests/system_tests_http2.py
index ba390df21..73991daac 100644
--- a/tests/system_tests_http2.py
+++ b/tests/system_tests_http2.py
@@ -1205,6 +1205,7 @@ class Http2AdaptorConnCounter(TestCase):
     Validate the HTTP/2 service connection counter
     """
     router: Qdrouterd
+
     @classmethod
     def setUpClass(cls):
         super(Http2AdaptorConnCounter, cls).setUpClass()
diff --git a/tests/system_tests_tcp_adaptor.py b/tests/system_tests_tcp_adaptor.py
index 6dad6b1d5..b9319fe2a 100644
--- a/tests/system_tests_tcp_adaptor.py
+++ b/tests/system_tests_tcp_adaptor.py
@@ -2521,6 +2521,7 @@ class TcpAdaptorConnCounter(TestCase):
     Validate the TCP service connection counter
     """
     router: Qdrouterd
+
     @classmethod
     def setUpClass(cls):
         super(TcpAdaptorConnCounter, cls).setUpClass()
@@ -2636,6 +2637,7 @@ class TcpAdaptorNoDelayedDelivery(TestCase):
     Ensure long lived TCP sessions are not counted as delayed deliveries
     """
     router: Qdrouterd
+
     @classmethod
     def setUpClass(cls):
         super(TcpAdaptorNoDelayedDelivery, cls).setUpClass()