diff --git a/qarnot/bucket.py b/qarnot/bucket.py
index 03479328..a33fa2cc 100644
--- a/qarnot/bucket.py
+++ b/qarnot/bucket.py
@@ -326,6 +326,7 @@ def add_directory(self, local, remote=""):
             files = map(_util.decode, files)
 
             remote_loc = dirpath.replace(local, remote, 1)
+            remote_loc = remote_loc.replace('\\', '/')
             for filename in files:
                 self.add_file(os.path.join(dirpath, filename),
                               posixpath.join(remote_loc, filename))