diff --git a/castellan/key_manager/key_manager.py b/castellan/key_manager/key_manager.py
index 6b5cee0..07b8829 100644
--- a/castellan/key_manager/key_manager.py
+++ b/castellan/key_manager/key_manager.py
@@ -110,7 +110,6 @@
         """
         pass
 
-    @abc.abstractmethod
     def list(self, context, object_type=None, metadata_only=False):
         """Lists the managed objects given the criteria.
 
@@ -123,4 +122,4 @@
         returned, depending on the metadata_only flag. If no objects are
         found, an empty list should be returned instead.
         """
-        pass
+        return []