diff --git a/base.cfg b/base.cfg
index ddf7eaba..90ecb92e 100644
--- a/base.cfg
+++ b/base.cfg
@@ -1,5 +1,6 @@
 [buildout]
 package-name = collective.z3cform.datagridfield
+package-extras = [test]
 
 versions = versions
 
diff --git a/travis-4.0.x.cfg b/travis-4.0.x.cfg
index 9fc99f93..b5aa915d 100644
--- a/travis-4.0.x.cfg
+++ b/travis-4.0.x.cfg
@@ -1,2 +1,2 @@
 [buildout]
-extends = base.cfg https://raw.github.com/collective/buildout.plonetest/master/travis-4.0.x.cfg
+extends = https://raw.github.com/collective/buildout.plonetest/master/travis-4.0.x.cfg base.cfg
diff --git a/travis-4.1.x.cfg b/travis-4.1.x.cfg
index 5aed8021..9709383b 100644
--- a/travis-4.1.x.cfg
+++ b/travis-4.1.x.cfg
@@ -1,2 +1,2 @@
 [buildout]
-extends = base.cfg https://raw.github.com/collective/buildout.plonetest/master/travis-4.1.x.cfg
+extends = https://raw.github.com/collective/buildout.plonetest/master/travis-4.1.x.cfg base.cfg
diff --git a/travis-4.2.x.cfg b/travis-4.2.x.cfg
index 9a8bf76d..75d88fef 100644
--- a/travis-4.2.x.cfg
+++ b/travis-4.2.x.cfg
@@ -1,2 +1,2 @@
 [buildout]
-extends = base.cfg https://raw.github.com/collective/buildout.plonetest/master/travis-4.2.x.cfg
+extends = https://raw.github.com/collective/buildout.plonetest/master/travis-4.2.x.cfg base.cfg
diff --git a/travis-4.3.x.cfg b/travis-4.3.x.cfg
index 5c1d7798..2e44fb4e 100644
--- a/travis-4.3.x.cfg
+++ b/travis-4.3.x.cfg
@@ -1,2 +1,2 @@
 [buildout]
-extends = base.cfg https://raw.github.com/collective/buildout.plonetest/master/travis-4.3.x.cfg
+extends = https://raw.github.com/collective/buildout.plonetest/master/travis-4.3.x.cfg base.cfg