diff --git a/api-docs/conf.py b/api-docs/conf.py
index 9007532..8cf4dcd 100644
--- a/api-docs/conf.py
+++ b/api-docs/conf.py
@@ -9,7 +9,7 @@ sys.path.insert(0, os.path.abspath('..'))
 
 MOCK_MODULES = ['argparse', 'cv2', 'dlib', 'numpy', 'pandas']
 for mod_name in MOCK_MODULES:
-  sys.modules[mod_name] = mock.MagicMock()
+    sys.modules[mod_name] = mock.MagicMock()
 
 extensions = [
     'sphinx.ext.autodoc',