diff --git a/tox.ini b/tox.ini
index ce63407de48d0c43e65faff97fd6ed26e92879de..91e63b46ecb4ae9d7efedb9ea16a54747a19db5a 100644
--- a/tox.ini
+++ b/tox.ini
@@ -3,6 +3,7 @@ envlist = arkindex_worker
 skipsdist=True
 
 [testenv]
+setenv = PYTHONPATH = {toxinidir}
 passenv = ARKINDEX_API_SCHEMA_URL
 commands =
   pytest