diff --git a/app/models/rtl.rb b/app/models/rtl.rb
index d4857c1fb91..e3a4946b3a0 100644
--- a/app/models/rtl.rb
+++ b/app/models/rtl.rb
@@ -19,7 +19,7 @@ class RTL
   end
 
   def rtl_locales
-    %w(he ar)
+    %w(he ar fa_IR)
   end
 
   def css_class