diff --git a/tests/conftest.py b/tests/conftest.py
index a07377194a..13778403e4 100644
--- a/tests/conftest.py
+++ b/tests/conftest.py
@@ -1,9 +1,14 @@
 import pytest
 import os
 
+# Note that we have to do this *before* `pipenv.environments` gets imported,
+# which is why we're doing it here as a side effect of importing this module.
+# CI=1 is necessary as a workaround for https://github.com/pypa/pipenv/issues/4909
+os.environ['CI'] = '1'
+
 def pytest_sessionstart(session):
-    # CI=1 is necessary as a workaround for https://github.com/pypa/pipenv/issues/4909
-    os.environ['CI'] = '1'
+    import pipenv.environments
+    assert pipenv.environments.PIPENV_IS_CI
 
 
 @pytest.fixture()