diff --git a/Lib/ntpath.py b/Lib/ntpath.py
index 2fd26b1..1cec895 100644
--- a/Lib/ntpath.py
+++ b/Lib/ntpath.py
@@ -561,6 +561,8 @@
                 path = _getfullpathname(path)
             except WindowsError:
                 pass # Bad path - return unchanged.
+        elif isinstance(path, bytes):
+            path = os.getcwdb()
         else:
             path = os.getcwd()
         return normpath(path)