diff --git a/lib/jsonpadding.dart b/lib/jsonpadding.dart
index 02d7f6a..8db4fd5 100644
--- a/lib/jsonpadding.dart
+++ b/lib/jsonpadding.dart
@@ -3,8 +3,14 @@
 import 'src/jsonp_call.dart';
 import 'dart:async';
 
-Future<dynamic> jsonp(dynamic uri) => new JsonpCall(uri).call();
+Future<dynamic> jsonp(dynamic uri, {String param}) =>
+    new JsonpCall(uri, param: param).call();
 
 class Jsonp {
-  Future<dynamic> get(dynamic uri) => jsonp(uri);
+  final String param;
+
+  Jsonp({this.param});
+
+  Future<dynamic> get(dynamic uri, {String param}) =>
+      jsonp(uri, param: param ?? this.param);
 }
diff --git a/lib/src/jsonp_call.dart b/lib/src/jsonp_call.dart
index 4bd1354..d163ade 100644
--- a/lib/src/jsonp_call.dart
+++ b/lib/src/jsonp_call.dart
@@ -12,8 +12,10 @@ class JsonpCall {
   final ScriptElement script = new ScriptElement();
   final String callback = _createId();
   Uri uri;
+  String _param = 'callback';
 
-  JsonpCall(dynamic uri) {
+  JsonpCall(dynamic uri, {String param}) {
+    _param = param ?? _param;
     this.uri = _createUri(uri, callback);
   }
 
@@ -36,7 +38,7 @@ class JsonpCall {
   Uri _createUri(dynamic uri, String callback) {
     uri = (uri is Uri) ? uri : Uri.parse(uri);
     Map parameters = new Map.from(uri.queryParameters);
-    parameters['callback'] = callback;
+    parameters[_param] = callback;
     return uri.replace(queryParameters: parameters);
   }
 }