diff --git a/Berksfile b/Berksfile
index 9972d51a..15e7c974 100644
--- a/Berksfile
+++ b/Berksfile
@@ -1,7 +1,8 @@
 source 'https://supermarket.chef.io'
 
+solver :ruby, :required
+
 metadata
 
 # cookbook for testing database provider:
-cookbook 'test-openstack-common-database',
-  path: 'spec/cookbooks/test-openstack-common-database'
+cookbook 'test-openstack-common-database', path: 'spec/cookbooks/test-openstack-common-database'