diff --git a/tests/conftest.py b/tests/conftest.py
index 7a99060..42e7425 100644
--- a/tests/conftest.py
+++ b/tests/conftest.py
@@ -4,7 +4,7 @@ import pytest
 from fastapi import FastAPI
 from httpx import AsyncClient
 
-environ["APP_ENV"] = "test"
+environ["ARGOS_APP_ENV"] = "test"
 
 
 @pytest.fixture