diff --git a/tox.ini b/tox.ini
index 952ba68..a9d10b5 100644
--- a/tox.ini
+++ b/tox.ini
@@ -28,6 +28,7 @@ passenv = *
 usedevelop = True
 setenv =
     DJANGO_SETTINGS_MODULE=examples.django_test_settings
+    PYTHONPATH=.
 deps =
     -e.[test]
     psycopg2-binary