diff --git a/pyperry/callbacks.py b/pyperry/callbacks.py
index 0c1231c..34f0601 100644
--- a/pyperry/callbacks.py
+++ b/pyperry/callbacks.py
@@ -27,7 +27,8 @@ def __init__(self, instances=[]):
 
         for instance in instances:
             if isinstance(instance, CallbackManager):
-                self.callbacks.update(instance.callbacks)
+                for callback_type, callbacks in instance.callbacks.iteritems():
+                    self.callbacks[callback_type] = list(callbacks)
             else:
                 raise ConfigurationError("CallbackManager type expected.")