diff --git a/Lib/UserString.py b/Lib/UserString.py
index 3251139..94eb66d 100755
--- a/Lib/UserString.py
+++ b/Lib/UserString.py
@@ -147,12 +147,12 @@
         raise TypeError, "unhashable type (it is mutable)"
     def __setitem__(self, index, sub):
         if index < 0:
-           index += len(self.data)
+            index += len(self.data)
         if index < 0 or index >= len(self.data): raise IndexError
         self.data = self.data[:index] + sub + self.data[index+1:]
     def __delitem__(self, index):
         if index < 0:
-           index += len(self.data)
+            index += len(self.data)
         if index < 0 or index >= len(self.data): raise IndexError
         self.data = self.data[:index] + self.data[index+1:]
     def __setslice__(self, start, end, sub):