diff --git a/confit/utils/xjson.py b/confit/utils/xjson.py
index 5a089cd..f49f36a 100644
--- a/confit/utils/xjson.py
+++ b/confit/utils/xjson.py
@@ -257,6 +257,7 @@ def __init__(self, value: str):
         self.value = value
         super().__init__(f"Malformed value: {value!r}")
 
+
 def loads(s: str):
     """
     Load an extended JSON string into a python object.
@@ -266,15 +267,18 @@ def loads(s: str):
         return XJsonTransformer(s).transform(_json_parser.parse(s))
     except Exception:
         # Detect malformed strings with unmatched quotes
-        if (s.startswith("'") and not s.endswith("'")) or (s.startswith('"') and not s.endswith('"')):
+        if (s.startswith("'") and not s.endswith("'")) or (
+            s.startswith('"') and not s.endswith('"')
+        ):
             raise MalformedValueError(s)
-        
+
         # Detect suspicious malformed patterns
         if any(char in s for char in ",{}[]") and not s.startswith(("'", '"')):
             raise MalformedValueError(s)
-        
+
         return s
-    
+
+
 def dumps(o: Any):
     """
     Dump a python object into an extended JSON string.
diff --git a/tests/test_config_instance.py b/tests/test_config_instance.py
index 00c261e..34b879c 100644
--- a/tests/test_config_instance.py
+++ b/tests/test_config_instance.py
@@ -691,6 +691,8 @@ def test_very_long_yaml_config():
     config = Config.from_yaml_str(
         """\
         a: {}
-        """.format("x" * 4200)
+        """.format(
+            "x" * 4200
+        )
     )
     assert config == {"a": "x" * 4200}