diff --git a/setup.py b/setup.py
index 8411fdd..5549659 100755
--- a/setup.py
+++ b/setup.py
@@ -63,14 +63,12 @@ setup(
     provides=["radicale"],
     scripts=["bin/radicale"],
     install_requires=["vobject"],
-    setup_requires=['pytest-runner'],
-    tests_require=['pytest-cov', 'pytest-flake8', 'pytest-isort', 'pytest'],
+    setup_requires=["pytest-runner"],
+    tests_require=["pytest-cov", "pytest-flake8", "pytest-isort", "pytest"],
     extras_require={
-        'test': [
-            'pytest-runner', 'pytest-cov', 'pytest-flake8', 'pytest-isort',
-            'pytest'
-        ]
-    },
+        "test": [
+            "pytest-runner", "pytest-cov", "pytest-flake8", "pytest-isort",
+            "pytest"]},
     keywords=["calendar", "addressbook", "CalDAV", "CardDAV"],
     classifiers=[
         "Development Status :: 5 - Production/Stable",