diff --git a/adafruit_pathlib.py b/adafruit_pathlib.py
index 98edb1e..c23096f 100644
--- a/adafruit_pathlib.py
+++ b/adafruit_pathlib.py
@@ -350,7 +350,7 @@ def iterdir(self):
             OSError: If self.is_dir() is False.
         """
         if not self.is_dir():
-            raise OSError(errno.ENOTDIR, f"Not a directory: {self._path}")
+            raise OSError(f"Not a directory: {self._path}")
         for name in os.listdir(self._path):
             yield Path(self._path, name)