diff --git a/setup.py b/setup.py
index eb1fbad..6f9db9d 100644
--- a/setup.py
+++ b/setup.py
@@ -96,8 +96,7 @@
         "Operating System :: POSIX :: Linux",
         "Topic :: Scientific/Engineering"
     ],
-#     setup_requires=["cython>=0.19"],
-#     install_requires=["cython>=0.19"],
+    install_requires=["numpy"],
     packages=["idlbridge"],
     ext_modules=cythonize(extensions, force=force, compiler_directives=directives)
 )