diff --git a/NEWS.rst b/NEWS.rst
index b22b13e..cf307be 100644
--- a/NEWS.rst
+++ b/NEWS.rst
@@ -1,3 +1,12 @@
+v16.12.1
+========
+
+Bugfixes
+--------
+
+- Restore functionality in .isdir and .isfile.
+
+
 v16.12.0
 ========
 
diff --git a/path/__init__.py b/path/__init__.py
index 1493108..df693ed 100644
--- a/path/__init__.py
+++ b/path/__init__.py
@@ -1096,6 +1096,7 @@ def isdir(self):  # pragma: no cover
             DeprecationWarning,
             stacklevel=2,
         )
+        return self.is_dir()
 
     def is_dir(self):
         """.. seealso:: :func:`os.path.isdir`"""
@@ -1107,6 +1108,7 @@ def isfile(self):  # pragma: no cover
             DeprecationWarning,
             stacklevel=2,
         )
+        return self.is_file()
 
     def is_file(self):
         """.. seealso:: :func:`os.path.isfile`"""