diff --git a/lib/geocoder/lookups/mapquest.rb b/lib/geocoder/lookups/mapquest.rb
index 44f473d6d2255b7cd974ef23b3ebf93c6613c663..08cd31d8de0d33d19d985188ddff854311fd17f3 100644
--- a/lib/geocoder/lookups/mapquest.rb
+++ b/lib/geocoder/lookups/mapquest.rb
@@ -14,7 +14,6 @@ module Geocoder::Lookup
     def query_url(query, reverse = false)
       params = {
         :format => "json",
-        :json_callback=>"?",
         :polygon => "1",
         :addressdetails => "1",
         :"accept-language" => Geocoder::Configuration.language