diff --git a/doc/conf.py b/doc/conf.py
index ee99e210..3ca2f6f1 100644
--- a/doc/conf.py
+++ b/doc/conf.py
@@ -326,26 +326,26 @@ epub_copyright = u'2013, Author'
 ##############################################################################
 ##
 ## Mock out imports with C dependencies because ReadTheDocs can't build them.
-#class Mock(object):
-    #def __init__(self, *args, **kwargs):
-        #pass
+class Mock(object):
+    def __init__(self, *args, **kwargs):
+        pass
 
-    #def __call__(self, *args, **kwargs):
-        #return Mock()
+    def __call__(self, *args, **kwargs):
+        return Mock()
 
-    #@classmethod
-    #def __getattr__(cls, name):
-        #if name in ('__file__', '__path__'):
-            #return '/dev/null'
-        #elif name[0] == name[0].upper():
-            #mockType = type(name, (), {})
-            #mockType.__module__ = __name__
-            #return mockType
-        #else:
-            #return Mock()
+    @classmethod
+    def __getattr__(cls, name):
+        if name in ('__file__', '__path__'):
+            return '/dev/null'
+        elif name[0] == name[0].upper():
+            mockType = type(name, (), {})
+            mockType.__module__ = __name__
+            return mockType
+        else:
+            return Mock()
 
-#MOCK_MODULES = [#'matplotlib', 'matplotlib.pyplot', 
-                #'pylab'
-                #]
-#for mod_name in MOCK_MODULES:
-    #sys.modules[mod_name] = Mock()
+MOCK_MODULES = [#'matplotlib', 'matplotlib.pyplot', 
+                'pylab'
+                ]
+for mod_name in MOCK_MODULES:
+    sys.modules[mod_name] = Mock()