diff --git a/docs/conf.py b/docs/conf.py
index bf1668d..743fb8c 100644
--- a/docs/conf.py
+++ b/docs/conf.py
@@ -21,7 +21,7 @@ def __getattr__(cls, name):
             return object
         return Mock()
 
-MOCK_MODULES = ['numpy', 'theano',
+MOCK_MODULES = ['numpy', 'theano', 'sklearn.cross_validation',
                 'sklearn.base', 'sklearn.pipeline', 'sklearn.preprocessing',
                 'pylearn2.termination_criteria', 'pylearn2.datasets', 'pylearn2.models',
                 'pylearn2.training_algorithms', 'pylearn2.costs.mlp.dropout',