Index: lib/xmlrpc/client.rb
===================================================================
--- lib/xmlrpc/client.rb	(revision 41241)
+++ lib/xmlrpc/client.rb	(working copy)
@@ -479,6 +479,8 @@ module XMLRPC # :nodoc:
 
       @http_last_response = resp
 
+      content_encoding = resp['Content-Encoding']
+
       data = resp.body
 
       if resp.code == "401"
@@ -499,7 +501,13 @@ module XMLRPC # :nodoc:
         end
       end
 
-      expected = resp["Content-Length"] || "<unknown>"
+      expected =
+        if %w[deflate gzip x-gzip].include? content_encoding then
+          "<unknown>"
+        else
+          resp["Content-Length"] || "<unknown>"
+        end
+
       if data.nil? or data.bytesize == 0
         raise "Wrong size. Was #{data.bytesize}, should be #{expected}"
       elsif expected != "<unknown>" and expected.to_i != data.bytesize and resp["Transfer-Encoding"].nil?