diff --git a/lib/i18n/backend/simple.rb b/lib/i18n/backend/simple.rb
index ce690484..7c7f4ebb 100644
--- a/lib/i18n/backend/simple.rb
+++ b/lib/i18n/backend/simple.rb
@@ -44,7 +44,7 @@ def store_translations(locale, data, options = {})
         def available_locales
           init_translations unless initialized?
           translations.inject([]) do |locales, (locale, data)|
-            locales << locale unless (data.keys - [:i18n]).empty?
+            locales << locale unless data.size <= 1 && (data.empty? || data.has_key?(:i18n))
             locales
           end
         end