Index: Lib/lib2to3/fixes/fix_imports.py
===================================================================
--- Lib/lib2to3/fixes/fix_imports.py	(revision 63318)
+++ Lib/lib2to3/fixes/fix_imports.py	(working copy)
@@ -17,6 +17,7 @@
 MAPPING = {"StringIO":  ("io", ["StringIO"]),
            "cStringIO": ("io", ["StringIO"]),
            "__builtin__" : ("builtins", builtin_names),
+           "markupbase": ("_markupbase", ["ParserBase"]),
           }