diff --git a/setup.py b/setup.py
index 19e9a25a..13f5cae2 100755
--- a/setup.py
+++ b/setup.py
@@ -82,9 +82,12 @@ tests_require = [
 
 
 class PyTest(TestCommand):
+    def initialize_options(self):
+        TestCommand.initialize_options(self)
+        self.test_suite = 'tests'
+
     def finalize_options(self):
         TestCommand.finalize_options(self)
-        self.test_suite = True
 
     def run_tests(self):
         # import here, cause outside the eggs aren't loaded