diff --git a/noxfile.py b/noxfile.py
index 2ccbfeae7..47611cdff 100644
--- a/noxfile.py
+++ b/noxfile.py
@@ -55,7 +55,9 @@
 UNIT_TEST_EXTERNAL_DEPENDENCIES: List[str] = []
 UNIT_TEST_LOCAL_DEPENDENCIES: List[str] = []
 UNIT_TEST_DEPENDENCIES: List[str] = []
-UNIT_TEST_EXTRAS: List[str] = []
+UNIT_TEST_EXTRAS: List[str] = [
+    "flaky",
+]
 UNIT_TEST_EXTRAS_BY_PYTHON: Dict[str, List[str]] = {}
 
 SYSTEM_TEST_PYTHON_VERSIONS: List[str] = ["3.12"]
diff --git a/setup.py b/setup.py
index ab5f467f8..fb2b94fad 100644
--- a/setup.py
+++ b/setup.py
@@ -50,8 +50,7 @@
     "opentelemetry-sdk <= 1.22.0; python_version<='3.7'",
     "opentelemetry-sdk >= 1.27.0; python_version>='3.8'",
 ]
-extras = {"libcst": "libcst >= 0.3.10,",
-          "flaky": "flaky"}
+extras = {"libcst": "libcst >= 0.3.10,", "flaky": "flaky"}
 url = "https://github.com/googleapis/python-pubsub"
 
 package_root = os.path.abspath(os.path.dirname(__file__))