diff --git a/lib/shoulda/matchers/action_controller/respond_with_matcher.rb b/lib/shoulda/matchers/action_controller/respond_with_matcher.rb
index ef6e1bcd1..2217b54c3 100644
--- a/lib/shoulda/matchers/action_controller/respond_with_matcher.rb
+++ b/lib/shoulda/matchers/action_controller/respond_with_matcher.rb
@@ -133,7 +133,7 @@ def symbol_to_status_code(potential_symbol)
           when :missing  then 404
           when :error    then 500..599
           when Symbol
-            ::Rack::Utils::SYMBOL_TO_STATUS_CODE[potential_symbol]
+            ::Rack::Utils.status_code(potential_symbol)
           else
             potential_symbol
           end