diff --git a/flask/__init__.py b/flask/__init__.py
index ee8508bc..d5161ad0 100644
--- a/flask/__init__.py
+++ b/flask/__init__.py
@@ -17,7 +17,7 @@ from jinja2 import Markup, escape
 
 from .app import Flask, Request, Response
 from .config import Config
-from .helpers import url_for, jsonify, json_available, flash, \
+from .helpers import url_for, jsonify, padded_jsonify, json_available, flash, \
     send_file, send_from_directory, get_flashed_messages, \
     get_template_attribute, make_response
 from .globals import current_app, g, request, session, _request_ctx_stack
diff --git a/flask/helpers.py b/flask/helpers.py
index 18eb6d0e..0477bb18 100644
--- a/flask/helpers.py
+++ b/flask/helpers.py
@@ -99,6 +99,11 @@ def jsonify(*args, **kwargs):
     return current_app.response_class(json.dumps(dict(*args, **kwargs),
         indent=None if request.is_xhr else 2), mimetype='application/json')
 
+def padded_jsonify(*args, **kwargs):
+    if __debug__:
+        _assert_have_json()
+    content = str(callback) + '(' + json.dumps(dict(*args, **kwargs)) + ')'
+    return current_app.response_class(content, mimetype='application/json')
 
 def make_response(*args):
     """Sometimes it is necessary to set additional headers in a view.  Because