diff --git a/buildout/development.cfg b/buildout/development.cfg
index 8795ccc2d6a83ee91f8c952bc144c664e88d4f3e..c87b4e94df340a0f8b67da24b5015522eb9544ff 100644
--- a/buildout/development.cfg
+++ b/buildout/development.cfg
@@ -18,6 +18,7 @@ force-zodb-update = true
 # zope.conf template part BEGIN
 debug-mode = on
 instancehome = ${buildout:var-directory}/zope-instance
+http-address = 18080
 # until we will have more control over products we need to redefine to insert
 # local products to be able to override
 products =
diff --git a/buildout/instance-profiles/zope.cfg b/buildout/instance-profiles/zope.cfg
index 3e558f82573556ebb8cd9b8d3574eed5a33e46e4..9c79bb9c656c5b22457b154c96ea6036f7288232 100644
--- a/buildout/instance-profiles/zope.cfg
+++ b/buildout/instance-profiles/zope.cfg
@@ -19,6 +19,7 @@ bt5-path = ${bt5-erp5:location}
 bt5 =
 force-zodb-update = false
 # zope.conf template part BEGIN
+# instancehome and http-address have to be defined
 # User modifable keys:
 products =
   products ${cmf15:location}/CMF/
@@ -28,7 +29,6 @@ products =
 environment =
 debug-mode = off
 ip-address = 0.0.0.0
-http-address = 18080
 # Good defaults, which do not have to be touch:
 clienthome = ${:instancehome}/var
 lib_path = ${:instancehome}/lib/python