diff --git a/spec/unit/ordinals_spec.rb b/spec/unit/ordinals_spec.rb
index 248b03c8..e26db87f 100644
--- a/spec/unit/ordinals_spec.rb
+++ b/spec/unit/ordinals_spec.rb
@@ -5,9 +5,10 @@
   # Mock Rails app in order to trigger the Railtie
   let(:app) { double :app, config: config }
   let(:config) { double :config, eager_load_namespaces: [], i18n: I18n, rails_i18n: RailsI18n }
+  let(:period_locales) { %w[be bs cs da de eo et fa fi hr hu is ka lb lt lv mk nb ne nn pl sk sl sq sr sw tr] }
 
   before do
-    I18n.available_locales = %w[fr en fr-CA fr-CH fr-FR gd]
+    I18n.available_locales = %w[fr en fr-CA fr-CH fr-FR gd]+ period_locales
 
     RailsI18n::Railtie.initializers.each { |init| init.run(app) }
     I18n.backend.reload!