Index: lib2to3/fixes/fix_imports.py
===================================================================
--- lib2to3/fixes/fix_imports.py	(revision 63742)
+++ lib2to3/fixes/fix_imports.py	(working copy)
@@ -265,6 +265,7 @@
                           "BasicTestRunner", "run_unittest", "run_doctest",
                           "threading_setup", "threading_cleanup", "reap_children"]),
            'commands': ('subprocess', ['getstatusoutput', 'getoutput']),
+           'UserString': ('collections', ['UserString']),
 }