diff --git a/Lib/genericpath.py b/Lib/genericpath.py
index db11f67..ce36451 100644
--- a/Lib/genericpath.py
+++ b/Lib/genericpath.py
@@ -149,7 +149,7 @@
         elif isinstance(s, bytes):
             hasbytes = True
         else:
-            raise TypeError('%s() argument must be str or bytes, not %r' %
-                            (funcname, s.__class__.__name__)) from None
+            raise TypeError(f'{funcname}() argument must be str, bytes, or '
+                            f'os.PathLike object, not {s.__class__.__name__!r}') from None
     if hasstr and hasbytes:
         raise TypeError("Can't mix strings and bytes in path components") from None