diff --git a/lib/js_locale_helper.rb b/lib/js_locale_helper.rb
index 21fba9804ef..377d11e5508 100644
--- a/lib/js_locale_helper.rb
+++ b/lib/js_locale_helper.rb
@@ -86,7 +86,7 @@ module JsLocaleHelper
   end
 
   def self.load_translations_merged(*locales)
-    locales = locales.compact
+    locales = locales.uniq.compact
     @loaded_merges ||= {}
     @loaded_merges[locales.join('-')] ||= begin
       all_translations = {}