diff --git a/buildout.cfg b/buildout.cfg
index 369a61c..b076ed9 100644
--- a/buildout.cfg
+++ b/buildout.cfg
@@ -23,4 +23,4 @@ eggs = zc.relation
 interpreter = py
 
 [sources]
-zc.relationship = git https://github.com/zopefoundation/zc.relationship branch=py3-compat
+zc.relationship = git https://github.com/zopefoundation/zc.relationship branch=master