diff --git a/src/hio/core/packeting.py b/src/hio/core/packeting.py
index e6e93ad..d8ca471 100644
--- a/src/hio/core/packeting.py
+++ b/src/hio/core/packeting.py
@@ -18,7 +18,7 @@
 
 
 
-class Part(hioing.MixIn):
+class Part(hioing.Mixin):
     """
     Base class for packet part classes with .packed .size and len
     """