diff --git a/tests/conftest.py b/tests/conftest.py
index 84c18a65..cdc17703 100644
--- a/tests/conftest.py
+++ b/tests/conftest.py
@@ -245,6 +245,7 @@ def gdalenv(request):
     import rasterio.env
 
     def fin():
-        rasterio.env.delenv()
-        rasterio.env._env = None
+        if rasterio.env._env:
+            rasterio.env.delenv()
+            rasterio.env._env = None
     request.addfinalizer(fin)