diff --git a/setup.py b/setup.py
index 6eacaeb..306458d 100644
--- a/setup.py
+++ b/setup.py
@@ -77,10 +77,6 @@ setup(
         'docs': ['sphinx-bluebrain-theme'],
     },
     url='https://github.com/BlueBrain/MorphIO/',
-    ext_modules=[CMakeExtension('morphio._morphio'),
-                 ],
-    cmdclass={'build_ext': CMakeBuild,
-              },
     packages=['morphio', 'morphio.mut', 'morphio.vasculature'],
     license="Apache License 2.0",
     keywords=['computational neuroscience',