diff --git a/setup.py b/setup.py
index 1744abca03fcbc7dab7613b63365fcec924b6a4d..db1d541e6856f5cfb80824212ebba472c91cf24d 100644
--- a/setup.py
+++ b/setup.py
@@ -150,8 +150,7 @@ setup(name='pyHealpix',
       author='Martin Reinecke',
       author_email='martin@mpa-garching.mpg.de',
       packages=[],
-      setup_requires={'pybind11': 'pybind11>=2.2.1'},
-      extras_require={'numpy': 'numpy>=1.10.4', 'pybind11': 'pybind11>=2.2.1'},
+      setup_requires=['numpy>=1.10.4', 'pybind11>=2.2.1'],
       ext_modules=get_extension_modules(),
-      install_requires=['pybind11>=2.2.1']
+      install_requires=['numpy>=1.10.4', 'pybind11>=2.2.1']
       )