diff --git a/cython/setup.py b/cython/setup.py
index aba3f189..d534afc0 100644
--- a/cython/setup.py
+++ b/cython/setup.py
@@ -129,6 +129,7 @@ setup(
     cmdclass={'build_ext': Build},
     python_requires=">=3.6",
     setup_requires=read('requirements.txt').splitlines(),
+    test_suite="tests",
     classifiers=[
         "Programming Language :: Python :: 3",
         "Programming Language :: Cython",