diff --git a/test/test_persistent_dict.py b/test/test_persistent_dict.py
index 339f0e5821aa5922d53d4fed0a0edb49e8a30ebf..53afd7774cb3a7ff7dca6c1fc7f7058853e51a2d 100644
--- a/test/test_persistent_dict.py
+++ b/test/test_persistent_dict.py
@@ -136,7 +136,7 @@ def test_persistent_dict_synchronization():
 def test_persistent_dict_cache_collisions():
     try:
         tmpdir = tempfile.mkdtemp()
-        pdict = PersistentDict(tmpdir)
+        pdict = PersistentDict("pytools-test", container_dir=tmpdir)
 
         key1 = PDictTestingKeyOrValue(1, hash_key=0)
         key2 = PDictTestingKeyOrValue(2, hash_key=0)