diff --git a/IPython/utils/py3compat.py b/IPython/utils/py3compat.py
index 7719a79..edd7b7d 100644
--- a/IPython/utils/py3compat.py
+++ b/IPython/utils/py3compat.py
@@ -239,4 +239,4 @@ else:
 
 def with_metaclass(meta, *bases):
     """Create a base class with a metaclass."""
-    return meta("NewBase", bases, {})
+    return meta("_NewBase", bases, {})