diff --git a/plone-4.3.x.cfg b/plone-4.3.x.cfg
index 224d6f2c32..5e84eba356 100644
--- a/plone-4.3.x.cfg
+++ b/plone-4.3.x.cfg
@@ -26,4 +26,4 @@ plone.schema = 1.4.0
 
 # latest version compatible with Python 2
 sphinxcontrib_websupport = 1.1.2
-
+stdlib-list = 0.6.0