diff --git a/tests/conftest.py b/tests/conftest.py
index 10482b8..86c34a3 100644
--- a/tests/conftest.py
+++ b/tests/conftest.py
@@ -1,3 +1,5 @@
+import os
+
 import pytest
 
 import click
@@ -7,3 +9,12 @@
 @pytest.fixture
 def runner():
     return CliRunner()
+
+
+@pytest.fixture(autouse=True)
+def clean_env():
+    old = dict(os.environ)
+    os.environ.pop("FORCE_COLOR", None)
+    os.environ.pop("NO_COLOR", None)
+    yield
+    os.environ = old