diff --git a/schoolyourself/schoolyourself.py b/schoolyourself/schoolyourself.py
index c6a4bd7..81af69a 100644
--- a/schoolyourself/schoolyourself.py
+++ b/schoolyourself/schoolyourself.py
@@ -1,5 +1,6 @@
 """The base class for School Yourself XBlocks (lessons and reviews)."""
 
+from __future__ import absolute_import
 import hmac
 import os
 import pkg_resources
diff --git a/schoolyourself/schoolyourself_lesson.py b/schoolyourself/schoolyourself_lesson.py
index 2cd7330..1d1e8f8 100644
--- a/schoolyourself/schoolyourself_lesson.py
+++ b/schoolyourself/schoolyourself_lesson.py
@@ -1,11 +1,12 @@
 """An XBlock that displays School Yourself lessons."""
 
-import urllib
+from __future__ import absolute_import
+import six.moves.urllib.request, six.moves.urllib.parse, six.moves.urllib.error
 
 from xblock.core import XBlock
 from xblock.fragment import Fragment
 
-from schoolyourself import SchoolYourselfXBlock
+from .schoolyourself import SchoolYourselfXBlock
 
 
 class SchoolYourselfLessonXBlock(SchoolYourselfXBlock):
@@ -36,7 +37,7 @@ def student_view(self, context=None):
 
       context = {
         "iframe_url": "%s/page/embed?%s" % (self.base_url,
-                                            urllib.urlencode(url_params)),
+                                            six.moves.urllib.parse.urlencode(url_params)),
         "screenshot_url": screenshot_url,
         "title": self.module_title,
         "description": self.module_description
diff --git a/schoolyourself/schoolyourself_review.py b/schoolyourself/schoolyourself_review.py
index e5f6398..cb3d3a3 100644
--- a/schoolyourself/schoolyourself_review.py
+++ b/schoolyourself/schoolyourself_review.py
@@ -1,13 +1,14 @@
 """An XBlock that displays School Yourself reviews and may publish grades."""
 
+from __future__ import absolute_import
 import hmac
-import urllib
+import six.moves.urllib.request, six.moves.urllib.parse, six.moves.urllib.error
 
 from xblock.core import XBlock
 from xblock.fields import Scope, String
 from xblock.fragment import Fragment
 
-from schoolyourself import SchoolYourselfXBlock
+from .schoolyourself import SchoolYourselfXBlock
 
 
 class SchoolYourselfReviewXBlock(SchoolYourselfXBlock):
@@ -45,11 +46,11 @@ def student_view(self, context=None):
                                                   self.module_id)
 
       mastery_url = "%s/progress/mastery?%s" % (
-          self.base_url, urllib.urlencode(mastery_url_params))
+          self.base_url, six.moves.urllib.parse.urlencode(mastery_url_params))
 
       context = {
         "iframe_url": "%s/review/embed?%s" % (
-            self.base_url, urllib.urlencode(iframe_url_params)),
+            self.base_url, six.moves.urllib.parse.urlencode(iframe_url_params)),
         "title": self.module_title,
         "icon_url": self.runtime.local_resource_url(self,
                                                     "public/review_icon.png"),
diff --git a/schoolyourself/schoolyourself_review_test.py b/schoolyourself/schoolyourself_review_test.py
index aa999bd..503e421 100644
--- a/schoolyourself/schoolyourself_review_test.py
+++ b/schoolyourself/schoolyourself_review_test.py
@@ -1,8 +1,9 @@
 """This file contains a unit test for the SchoolYourselfReviewXBlock."""
 
+from __future__ import absolute_import
 import unittest
 
-from schoolyourself_review import SchoolYourselfReviewXBlock
+from .schoolyourself_review import SchoolYourselfReviewXBlock
 
 from mock import Mock
 from xblock.fields import ScopeIds
diff --git a/setup.py b/setup.py
index 985c200..2ca2929 100644
--- a/setup.py
+++ b/setup.py
@@ -1,5 +1,6 @@
 """Setup for schoolyourself-lesson XBlock."""
 
+from __future__ import absolute_import
 import os
 from setuptools import setup