diff --git a/poetry/installation/executor.py b/poetry/installation/executor.py
index 2cc86e20cc5..caa5fdd13d8 100644
--- a/poetry/installation/executor.py
+++ b/poetry/installation/executor.py
@@ -616,11 +616,7 @@ def _download_link(self, operation, link):
             for hash_type in hash_types:
                 archive_hashes.add(
                     "{}:{}".format(
-                        hash_type,
-                        FileDependency(
-                            package.name,
-                            path,
-                        ).hash(hash_type),
+                        hash_type, FileDependency(package.name, path).hash(hash_type),
                     )
                 )
 
diff --git a/tests/installation/test_executor.py b/tests/installation/test_executor.py
index 2aaf1cedf55..6bef9c44c95 100644
--- a/tests/installation/test_executor.py
+++ b/tests/installation/test_executor.py
@@ -336,11 +336,7 @@ def test_executor_should_hash_links(config, io, pool, mocker, fixture_dir, tmp_d
         .joinpath("demo-0.1.0-py2.py3-none-any.whl")
         .as_uri()
     )
-    mocker.patch.object(
-        Chef,
-        "get_cached_archive_for_link",
-        side_effect=lambda _: link,
-    )
+    mocker.patch.object(Chef, "get_cached_archive_for_link", side_effect=lambda _: link)
 
     env = MockEnv(path=Path(tmp_dir))
     executor = Executor(env, pool, config, io)
@@ -362,11 +358,7 @@ def test_executor_should_hash_links(config, io, pool, mocker, fixture_dir, tmp_d
 
 def test_executor_should_hash_paths(config, io, pool, mocker, fixture_dir, tmp_dir):
     link = fixture_dir("distributions").joinpath("demo-0.1.0-py2.py3-none-any.whl")
-    mocker.patch.object(
-        Chef,
-        "get_cached_archive_for_link",
-        side_effect=lambda _: link,
-    )
+    mocker.patch.object(Chef, "get_cached_archive_for_link", side_effect=lambda _: link)
 
     env = MockEnv(path=Path(tmp_dir))
     executor = Executor(env, pool, config, io)