diff --git a/software/erp5testnode/software.cfg b/software/erp5testnode/software.cfg
index dccf2c1ac8145249239b091bd34e3cdd6400254a..3c58f3b9ff1760c064a53e6f302e572da8ed8620 100644
--- a/software/erp5testnode/software.cfg
+++ b/software/erp5testnode/software.cfg
@@ -18,7 +18,7 @@ extends =
   ../../component/lxml-python/buildout.cfg
   ../../component/zip/buildout.cfg
 
-parts =
+parts +=
   template
   bootstrap
   eggs