diff --git a/tomlkit/toml_file.py b/tomlkit/toml_file.py
index d05a62f..7459130 100644
--- a/tomlkit/toml_file.py
+++ b/tomlkit/toml_file.py
@@ -1,10 +1,20 @@
 import os
 import re
 
+from typing import TYPE_CHECKING
+
 from tomlkit.api import loads
 from tomlkit.toml_document import TOMLDocument
 
 
+if TYPE_CHECKING:
+    from _typeshed import StrPath as _StrPath
+else:
+    from typing import Union
+
+    _StrPath = Union[str, os.PathLike]
+
+
 class TOMLFile:
     """
     Represents a TOML file.
@@ -12,7 +22,7 @@ class TOMLFile:
     :param path: path to the TOML file
     """
 
-    def __init__(self, path: str) -> None:
+    def __init__(self, path: _StrPath) -> None:
         self._path = path
         self._linesep = os.linesep