diff --git a/CHANGES.rst b/CHANGES.rst
index 7772ac7e29..32963027cc 100644
--- a/CHANGES.rst
+++ b/CHANGES.rst
@@ -31,6 +31,10 @@ Features
   to ``add_route`` is the empty string (``''``).
   See https://github.com/Pylons/pyramid/pull/3420
 
+- No longer define ``pyramid.request.Request.json_body`` which is already
+  provided by WebOb. This allows the attribute to now be settable.
+  See https://github.com/Pylons/pyramid/pull/3447
+
 Bug Fixes
 ---------
 
diff --git a/docs/api/request.rst b/docs/api/request.rst
index 50a34884b0..e7b2edc9a0 100644
--- a/docs/api/request.rst
+++ b/docs/api/request.rst
@@ -283,17 +283,6 @@
 
    .. automethod:: resource_path
 
-   .. attribute:: json_body
-
-       This property will return the JSON-decoded variant of the request
-       body.  If the request body is not well-formed JSON, or there is no
-       body associated with this request, this property will raise an
-       exception.
-       
-       .. seealso::
-       
-           See also :ref:`request_json_body`.
-
    .. method:: set_property(callable, name=None, reify=False)
 
        Add a callable or a property descriptor to the request instance.
diff --git a/docs/narr/webob.rst b/docs/narr/webob.rst
index 665bbddc93..e0524583fd 100644
--- a/docs/narr/webob.rst
+++ b/docs/narr/webob.rst
@@ -287,7 +287,7 @@ that has a body suitable for reading via ``request.json_body`` using Python's
     import json
 
     json_payload = json.dumps({'a':1})
-    headers = {'Content-Type':'application/json; charset=utf-8'}
+    headers = {'Content-Type':'application/json'}
     req = urllib2.Request('http://localhost:6543/', json_payload, headers)
     resp = urllib2.urlopen(req)
 
diff --git a/src/pyramid/request.py b/src/pyramid/request.py
index 23c00468dc..b9bd7451af 100644
--- a/src/pyramid/request.py
+++ b/src/pyramid/request.py
@@ -1,5 +1,4 @@
 from collections import deque
-import json
 
 from zope.interface import implementer
 from zope.interface.interface import InterfaceClass
@@ -229,10 +228,6 @@ def is_response(self, ob):
             return False
         return adapted is ob
 
-    @property
-    def json_body(self):
-        return json.loads(text_(self.body, self.charset))
-
 
 def route_request_iface(name, bases=()):
     # zope.interface treats the __name__ as the __doc__ and changes __name__