diff --git a/src/js/uint.js b/src/js/uint.js
index c02d8b27..d95ccb51 100644
--- a/src/js/uint.js
+++ b/src/js/uint.js
@@ -20,8 +20,8 @@ var UInt = function () {
   this._value  = NaN;
 };
 
-UInt.json_rewrite = function (j) {
-  return this.from_json(j).to_json();
+UInt.json_rewrite = function (j, opts) {
+  return this.from_json(j).to_json(opts);
 };
 
 // Return a new UInt from j.
diff --git a/src/js/uint160.js b/src/js/uint160.js
index ee17524d..12c7ff04 100644
--- a/src/js/uint160.js
+++ b/src/js/uint160.js
@@ -59,8 +59,8 @@ UInt160.prototype.to_json = function (opts) {
 
   var output = Base.encode_check(Base.VER_ACCOUNT_ID, this.to_bytes());
 
-  if (config.gateways && output in config.gateways && !opts.no_gateway)
-    output = config.gateways[output];
+  if (opts.gateways && output in opts.gateways)
+    output = opts.gateways[output];
    
   return output;
 };