diff --git a/test/test_pytools.py b/test/test_pytools.py
index cf55eacbd8bbee95c16e3e9d8660a987b7ce559b..8e6ef68a3d90a074795b9981355388214610e267 100644
--- a/test/test_pytools.py
+++ b/test/test_pytools.py
@@ -497,8 +497,8 @@ def test_tag():
     # Need a subclass that defines the copy function in order to test.
     class TaggableWithCopy(Taggable):
 
-        def copy(self, **kwargs):
-            return TaggableWithCopy(kwargs["tags"])
+        def _with_new_tags(self, tags):
+            return TaggableWithCopy(tags)
 
     class FairRibbon(Tag):
         pass