diff --git a/config_convert/converters/toml_converter.py b/config_convert/converters/toml_converter.py
index fccc7e7..dbbb6da 100644
--- a/config_convert/converters/toml_converter.py
+++ b/config_convert/converters/toml_converter.py
@@ -23,7 +23,7 @@ class TOMLConverter(Converter):
         return tomllib.loads(data)
 
     def dumps(self, data: Dict[str, Any], indent: Optional[int] = None) -> str:
-        output = []
+        output: list = []
         self._write_dict(data, output, indent=0)
         return "\n".join(output)