diff --git a/common/lib/xmodule/xmodule/modulestore/__init__.py b/common/lib/xmodule/xmodule/modulestore/__init__.py
index e59e4bd68e..6c77127d7e 100644
--- a/common/lib/xmodule/xmodule/modulestore/__init__.py
+++ b/common/lib/xmodule/xmodule/modulestore/__init__.py
@@ -190,6 +190,13 @@ class Location(_LocationBase):
         return "Location%s" % repr(tuple(self))
 
 
+    @property
+    def course_id(self):
+        """Return the ID of the Course that this item belongs to by looking
+        at the location URL hierachy"""
+        return "/".join([self.org, self.course, self.name])
+
+
 class ModuleStore(object):
     """
     An abstract interface for a database backend that stores XModuleDescriptor
diff --git a/lms/djangoapps/courseware/module_render.py b/lms/djangoapps/courseware/module_render.py
index 852e3d8a77..ad656f8980 100644
--- a/lms/djangoapps/courseware/module_render.py
+++ b/lms/djangoapps/courseware/module_render.py
@@ -2,6 +2,7 @@ import json
 import logging
 
 from django.conf import settings
+from django.core.urlresolvers import reverse
 from django.http import Http404
 from django.http import HttpResponse
 from django.views.decorators.csrf import csrf_exempt
@@ -125,7 +126,7 @@ def get_module(user, request, location, student_module_cache, position=None):
     
     '''
     descriptor = modulestore().get_item(location)
-    
+
     #TODO Only check the cache if this module can possibly have state
     instance_module = None
     shared_module = None
@@ -146,7 +147,14 @@ def get_module(user, request, location, student_module_cache, position=None):
 
     # TODO (vshnayder): fix hardcoded urls (use reverse)
     # Setup system context for module instance
-    ajax_url = settings.MITX_ROOT_URL + '/modx/' + descriptor.location.url() + '/'
+
+    ajax_url = reverse('modx_dispatch', 
+                       kwargs=dict(course_id=descriptor.location.course_id,
+                                   id=descriptor.location.url(),
+                                   dispatch=''),
+                       )
+
+    # ajax_url = settings.MITX_ROOT_URL + '/modx/' + descriptor.location.url() + '/'
 
     # Fully qualified callback URL for external queueing system
     xqueue_callback_url = (request.build_absolute_uri('/') + settings.MITX_ROOT_URL +
@@ -308,7 +316,7 @@ def xqueue_callback(request, userid, id, dispatch):
     return HttpResponse("")
 
 
-def modx_dispatch(request, dispatch=None, id=None):
+def modx_dispatch(request, dispatch=None, id=None, course_id=None):
     ''' Generic view for extensions. This is where AJAX calls go.
 
     Arguments:
diff --git a/lms/urls.py b/lms/urls.py
index bb3952b73c..c6cecb74d5 100644
--- a/lms/urls.py
+++ b/lms/urls.py
@@ -2,7 +2,6 @@ from django.conf import settings
 from django.conf.urls import patterns, include, url
 from django.contrib import admin
 from django.conf.urls.static import static
-
 import django.contrib.auth.views
 
 # Uncomment the next two lines to enable the admin:
@@ -101,7 +100,9 @@ if settings.COURSEWARE_ENABLED:
         url(r'^masquerade/', include('masquerade.urls')),
         url(r'^jump_to/(?P<location>.*)$', 'courseware.views.jump_to', name="jump_to"),
 
-        url(r'^modx/(?P<id>.*?)/(?P<dispatch>[^/]*)$', 'courseware.module_render.modx_dispatch'), #reset_problem'),
+        url(r'^courses/(?P<course_id>[^/]+/[^/]+/[^/]+)/modx/(?P<id>.*?)/(?P<dispatch>[^/]*)$',
+            'courseware.module_render.modx_dispatch',
+            name='modx_dispatch'),
         url(r'^xqueue/(?P<userid>[^/]*)/(?P<id>.*?)/(?P<dispatch>[^/]*)$', 'courseware.module_render.xqueue_callback'),
         url(r'^change_setting$', 'student.views.change_setting'),