diff --git a/doc/conf.py b/doc/conf.py
index 4c377cb6..b6dad7fd 100644
--- a/doc/conf.py
+++ b/doc/conf.py
@@ -103,9 +103,10 @@ class Mock(object):
 #import mock
 
 print "Mocking"
-MOCK_MODULES = ['sympy', 
-    'sympy.utilities', 'sympy.utilities.codegen', 'sympy.core.cache', 
-    'sympy.core', 'sympy.parsing', 'sympy.parsing.sympy_parser', 
+MOCK_MODULES = ['sympy',
+    'sympy.utilities', 'sympy.utilities.codegen', 'sympy.core.cache',
+    'sympy.core', 'sympy.parsing', 'sympy.parsing.sympy_parser',
+    'matplotlib.pyplot'
     ]
 for mod_name in MOCK_MODULES:
     sys.modules[mod_name] = Mock()