diff --git a/pyproject.toml b/pyproject.toml
index 19f53c5..315548c 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -119,6 +119,8 @@ python =
 [testenv]
 deps =
     .[dev]
+passenv =
+    USERNAME
 commands =
     pytest -v --color=yes --cov=photon_mosaic --cov-report=xml
 """