diff --git a/setup.py b/setup.py
index 6494554202e..a74b87e1b57 100644
--- a/setup.py
+++ b/setup.py
@@ -140,8 +140,7 @@ ENABLE_DOCUMENTATION_BUILD = os.environ.get(
     'GRPC_PYTHON_ENABLE_DOCUMENTATION_BUILD', False)
 
 def check_linker_need_libatomic():
-  """Test if linker on system needs libatomic.
-  """
+  """Test if linker on system needs libatomic."""
   code_test = (b'#include <atomic>\n' +
                b'int main() { return std::atomic<int64_t>{}; }')
   cc_test = subprocess.Popen(['cc', '-x', 'c++', '-std=c++11', '-'],
diff --git a/tools/distrib/python/grpcio_tools/setup.py b/tools/distrib/python/grpcio_tools/setup.py
index 57075834154..7325e4bed33 100644
--- a/tools/distrib/python/grpcio_tools/setup.py
+++ b/tools/distrib/python/grpcio_tools/setup.py
@@ -67,8 +67,7 @@ BUILD_WITH_CYTHON = os.environ.get('GRPC_PYTHON_BUILD_WITH_CYTHON', False)
 
 
 def check_linker_need_libatomic():
-    """Test if linker on system needs libatomic.
-    """
+    """Test if linker on system needs libatomic."""
     code_test = (b'#include <atomic>\n' +
                  b'int main() { return std::atomic<int64_t>{}; }')
     cc_test = subprocess.Popen(