diff --git a/pupy/packages/windows/all/ntfs_streams.py b/pupy/packages/windows/all/ntfs_streams.py
index 9c7dc3a9..848b0073 100644
--- a/pupy/packages/windows/all/ntfs_streams.py
+++ b/pupy/packages/windows/all/ntfs_streams.py
@@ -64,7 +64,7 @@ def get_streams(filename):
     if not NTFS_STREAMS_API_PRESENT:
         return []
 
-    if type(filename) == str:
+    if type(filename) == bytes:
         filename = filename.decode(
             getfilesystemencoding())