diff --git a/setup.py b/setup.py
index e0a10c47..fd732b81 100644
--- a/setup.py
+++ b/setup.py
@@ -59,6 +59,6 @@ def run_tests(self):
         'Topic :: Software Development :: Testing',
         'Topic :: Software Development :: User Interfaces',
     ],
-    tests_requires=['pytest'],
+    tests_require=['pytest'],
     cmdclass={'test': PyTest},
 )