diff --git a/tests/conftest.py b/tests/conftest.py
index 10482b8..25827a0 100644
--- a/tests/conftest.py
+++ b/tests/conftest.py
@@ -7,3 +7,9 @@ from click.testing import CliRunner
 @pytest.fixture
 def runner():
     return CliRunner()
+
+
+@pytest.fixture(autouse=True)
+def clean_env(monkeypatch):
+    monkeypatch.delenv("FORCE_COLOR", raising=False)
+    monkeypatch.delenv("NO_COLOR", raising=False)