diff --git a/tests/test_metrics.py b/tests/test_metrics.py
index 47ce326..55f4042 100644
--- a/tests/test_metrics.py
+++ b/tests/test_metrics.py
@@ -20,7 +20,7 @@
 def requests_session():
     # Ignore system proxies, see https://stackoverflow.com/a/28521696
     with requests.Session() as session:
-        session.trust_env = False
+        session.trust_env = False  # type: ignore
         yield session