The usual :)
diff --git a/Lib/dos-8x3/reconver.py b/Lib/dos-8x3/reconver.py
index 2b044b6..7c2d376 100644
--- a/Lib/dos-8x3/reconver.py
+++ b/Lib/dos-8x3/reconver.py
@@ -1,6 +1,6 @@
 #! /usr/bin/env python1.5
 
-"""Convert old ("regex") regular expressions to new syntax ("re").
+r"""Convert old ("regex") regular expressions to new syntax ("re").
 
 When imported as a module, there are two functions, with their own
 strings: