diff --git a/lib/omniauth/strategies/facebook.rb b/lib/omniauth/strategies/facebook.rb
index 414173b..5ff09ee 100644
--- a/lib/omniauth/strategies/facebook.rb
+++ b/lib/omniauth/strategies/facebook.rb
@@ -83,7 +83,7 @@ module OmniAuth
         if @authorization_code_from_signed_request_in_cookie
           ''
         else
-          options[:callback_url] || super
+          options[:callback_url] || (full_host + script_name + callback_path)
         end
       end