diff --git a/jwt/algorithms.py b/jwt/algorithms.py
index 1d8e6f522..1a34bd190 100644
--- a/jwt/algorithms.py
+++ b/jwt/algorithms.py
@@ -473,7 +473,9 @@ def to_jwk(key_obj):
             }
 
             if isinstance(key_obj, EllipticCurvePrivateKey):
-                obj["d"] = to_base64url_uint(key_obj.private_numbers().private_value).decode()
+                obj["d"] = to_base64url_uint(
+                    key_obj.private_numbers().private_value
+                ).decode()
 
             return json.dumps(obj)
 
diff --git a/tests/keys/testkey_ec_secp192r1.priv b/tests/keys/testkey_ec_secp192r1.priv
index 9f9301bb5..0f4d1c71b 100644
--- a/tests/keys/testkey_ec_secp192r1.priv
+++ b/tests/keys/testkey_ec_secp192r1.priv
@@ -2,4 +2,4 @@
 MG8CAQAwEwYHKoZIzj0CAQYIKoZIzj0DAQEEVTBTAgEBBBiON6kYcPu8ZUDRTu8W
 eXJ2FmX7e9yq0hahNAMyAARHecLjkXWDUJfZ4wiFH61JpmonCYH1GpinVlqw68Sf
 wtDHg2F6SifQEFC6VKj1ZXw=
------END PRIVATE KEY-----
\ No newline at end of file
+-----END PRIVATE KEY-----
diff --git a/tests/test_algorithms.py b/tests/test_algorithms.py
index ef915c242..01a41d9b6 100644
--- a/tests/test_algorithms.py
+++ b/tests/test_algorithms.py
@@ -319,11 +319,11 @@ def test_ec_to_jwk_with_valid_curves(self):
 
             with open(key_path(f"jwk_ec_pub_{curve}.json")) as keyfile:
                 pub_key = algo.from_jwk(keyfile.read())
-                assert json.loads(algo.to_jwk(pub_key))['crv'] == curve
+                assert json.loads(algo.to_jwk(pub_key))["crv"] == curve
 
             with open(key_path(f"jwk_ec_key_{curve}.json")) as keyfile:
                 priv_key = algo.from_jwk(keyfile.read())
-                assert json.loads(algo.to_jwk(priv_key))['crv'] == curve
+                assert json.loads(algo.to_jwk(priv_key))["crv"] == curve
 
     @crypto_required
     def test_ec_to_jwk_with_invalid_curve(self):