diff --git a/amqtt/mqtt/packet.py b/amqtt/mqtt/packet.py
index 38ad4aa..aeab916 100644
--- a/amqtt/mqtt/packet.py
+++ b/amqtt/mqtt/packet.py
@@ -9,7 +9,8 @@ except ImportError:
     UTC = timezone.utc
 
 from struct import unpack
-from typing_extensions import Generic, Self, TypeVar
+from typing import Generic
+from typing_extensions import Self, TypeVar
 
 from amqtt.adapters import ReaderAdapter, WriterAdapter
 from amqtt.codecs_amqtt import bytes_to_hex_str, decode_packet_id, int_to_bytes, read_or_raise
diff --git a/tests/test_cli.py b/tests/test_cli.py
index 239c3d8..766fb00 100644
--- a/tests/test_cli.py
+++ b/tests/test_cli.py
@@ -56,18 +56,21 @@ async def broker(config_file):
 
 def test_cli_help_messages():
     """Test that help messages are displayed correctly."""
+    env = os.environ.copy()
+    env['NO_COLOR'] = "1"
+
     amqtt_path = "amqtt"
-    output = subprocess.check_output([amqtt_path, "--help"])
+    output = subprocess.check_output([amqtt_path, "--help"], env=env)
     assert "Usage: amqtt" in output.decode("utf-8")
 
 
     amqtt_sub_path = "amqtt_sub"
-    output = subprocess.check_output([amqtt_sub_path, "--help"])
+    output = subprocess.check_output([amqtt_sub_path, "--help"], env=env)
     assert "Usage: amqtt_sub" in output.decode("utf-8")
 
 
     amqtt_pub_path = "amqtt_pub"
-    output = subprocess.check_output([amqtt_pub_path, "--help"])
+    output = subprocess.check_output([amqtt_pub_path, "--help"], env=env)
     assert "Usage: amqtt_pub" in output.decode("utf-8")