diff --git a/samcli/local/layers/layer_downloader.py b/samcli/local/layers/layer_downloader.py
index 20e06b136a..9dabe463e5 100644
--- a/samcli/local/layers/layer_downloader.py
+++ b/samcli/local/layers/layer_downloader.py
@@ -108,7 +108,7 @@ def download(self, layer: LayerVersion, force=False) -> LayerVersion:
             return layer
 
         current_thread_id = str(threading.get_ident())
-        layer_zip_path = f'{layer.codeuri}_{current_thread_id}.zip'
+        layer_zip_path = f"{layer.codeuri}_{current_thread_id}.zip"
         layer_zip_uri = self._fetch_layer_uri(layer)
         unzip_from_uri(
             layer_zip_uri,
diff --git a/tests/integration/local/start_api/test_start_api.py b/tests/integration/local/start_api/test_start_api.py
index 078094f720..f0d75e5dc5 100644
--- a/tests/integration/local/start_api/test_start_api.py
+++ b/tests/integration/local/start_api/test_start_api.py
@@ -3219,6 +3219,7 @@ def test_can_invoke_lambda_layer_successfully(self):
         self.assertEqual(response.status_code, 200)
         self.assertEqual(response.content.decode("utf-8"), '"Layer1"')
 
+
 class TestWarmContainersMultipleRemoteLayersInvoke(WarmContainersWithRemoteLayersBase):
     template_path = "/testdata/start_api/template-warm-containers-multi-layers.yaml"
     container_mode = ContainersInitializationMode.EAGER.value
@@ -3232,6 +3233,7 @@ def test_can_invoke_lambda_layer_successfully(self):
         self.assertEqual(response.status_code, 200)
         self.assertEqual(response.content.decode("utf-8"), '"Layer1"')
 
+
 class TestDisableAuthorizer(StartApiIntegBaseClass):
     # integration test for scenario: 'sam local start-api --disable-authorizer'
     template_path = "/testdata/start_api/lambda_authorizers/serverless-api-props.yaml"