diff --git a/stack/erp5/buildout.cfg b/stack/erp5/buildout.cfg
index bd2efe0561243ca0fecf7d46ce01f2db0db906a5..b574dff8c18060c84e97246a11fa27bea26f06f9 100644
--- a/stack/erp5/buildout.cfg
+++ b/stack/erp5/buildout.cfg
@@ -650,7 +650,7 @@ polib = 1.0.0
 psutil = 0.4.1
 python-ldap = 2.4.9
 python-magic = 0.4.2
-python-memcached = 1.47
+python-memcached = 1.47-ipv6-1
 restkit = 4.1.2
 rtjp-eventlet = 0.3.2
 setuptools = 0.6c12dev-r88846