diff --git a/Lib/xmlrpclib.py b/Lib/xmlrpclib.py
index efb0a7b..da96420 100644
--- a/Lib/xmlrpclib.py
+++ b/Lib/xmlrpclib.py
@@ -622,7 +622,7 @@
         write("<value><string>")
         write(escape(value))
         write("</string></value>\n")
-    dispatch[str8] = dump_string
+    dispatch[bytes] = dump_string
 
     def dump_unicode(self, value, write, escape=escape):
         write("<value><string>")