diff --git a/tests/test_select.py b/tests/test_select.py
index dcf83aab29303ab4ac9c2d6035467d215f40d53e..f20022ce3d73be5fabaaacef1c77acaee40fa6b0 100644
--- a/tests/test_select.py
+++ b/tests/test_select.py
@@ -68,7 +68,7 @@ def setup_module():
     house.description = "A rather large house"
     house.add_parent("TestHouse")
     house.add_property(rt_person, name="TestOwner", value=owner)
-    house.add_property("TestWindow", window)
+    house.add_property("TestWindow", [window], datatype=db.LIST("TestWindow"))
     house.add_property("TestDoor", door)
     house.insert()