diff --git a/lib/rate_limiting.rb b/lib/rate_limiting.rb
index 88b4e53..8a7a1c3 100644
--- a/lib/rate_limiting.rb
+++ b/lib/rate_limiting.rb
@@ -25,7 +25,7 @@ def respond(env, limit_header)
   def rate_limit_exceeded(accept)
     case accept.gsub(/;.*/, "").split(',')[0]
     when "text/xml"         then message, type  = xml_error("403", "Rate Limit Exceeded"), "text/xml"
-    when "application/json" then  message, type  = ["Rate Limit Exceeded"].to_json, "application/json"
+    when "application/json" then  message, type  = ["Rate Limit Exceeded"], "application/json"
     else
       message, type  = ["Rate Limit Exceeded"], "text/html"
     end