diff --git a/doc/source/conf.py b/doc/source/conf.py
index c74904b6b..0409f3d8d 100644
--- a/doc/source/conf.py
+++ b/doc/source/conf.py
@@ -47,7 +47,7 @@ class Mock(MagicMock):
     def __getattr__(cls, name):
             return Mock()
 
-MOCK_MODULES = ['scipy.linalg.blas', 'blas', 'scipy.linalg', 'scipy', 'scipy.special', 'scipy.integrate']
+MOCK_MODULES = ['scipy.linalg.blas', 'blas', 'scipy.linalg', 'scipy', 'scipy.special', 'scipy.integrate', 'scipy.io']
 sys.modules.update((mod_name, Mock()) for mod_name in MOCK_MODULES)
 
 # Add any paths that contain templates here, relative to this directory.