diff --git a/tests/test_utils_get_adj.py b/tests/test_utils_get_adj.py
index 03a2051a6..5e7672683 100644
--- a/tests/test_utils_get_adj.py
+++ b/tests/test_utils_get_adj.py
@@ -7,11 +7,9 @@ from slic.utils.get_adj import *
 
 @pytest.fixture(autouse=True)
 def cleanup_adjustables():
-    instances(SubAdjustable).clear() 
-    instances(Adjustable).clear() 
+    instances(Adjustable, weak=True).clear() 
     yield
-    instances(SubAdjustable).clear()
-    instances(Adjustable).clear() 
+    instances(Adjustable, weak=True).clear() 
 
 class SubAdjustable(Adjustable):
     def __init__(self, *a, **kw):