diff --git a/Berksfile b/Berksfile
index 44d58c6..e9346aa 100644
--- a/Berksfile
+++ b/Berksfile
@@ -1,5 +1,7 @@
 source 'https://supermarket.chef.io'
 
+solver :ruby, :required
+
 %w(-common).each do |cookbook|
   if Dir.exist?("../cookbook-openstack#{cookbook}")
     cookbook "openstack#{cookbook}", path: "../cookbook-openstack#{cookbook}"