diff --git a/Lib/UserString.py b/Lib/UserString.py
index f28e54c44102..e8e0fedd87f7 100755
--- a/Lib/UserString.py
+++ b/Lib/UserString.py
@@ -113,6 +113,8 @@ def rjust(self, width, *args):
     def rstrip(self, chars=None): return self.__class__(self.data.rstrip(chars))
     def split(self, sep=None, maxsplit=-1):
         return self.data.split(sep, maxsplit)
+    def rsplit(self, sep=None, maxsplit=-1):
+        return self.data.rsplit(sep, maxsplit)
     def splitlines(self, keepends=0): return self.data.splitlines(keepends)
     def startswith(self, prefix, start=0, end=sys.maxint):
         return self.data.startswith(prefix, start, end)