diff --git a/pgfw/Audio.py b/pgfw/Audio.py
index b020eb2..3a65658 100644
--- a/pgfw/Audio.py
+++ b/pgfw/Audio.py
@@ -104,10 +104,10 @@ class Audio(Animation):
                 else:
                     for node, branches, leaves in os.walk(root, followlinks=True):
                         for leaf in leaves:
-                            prefix = re.sub(root, "", node)
-                            prefix = re.sub("^/", "", prefix)
+                            prefix = re.sub(r"{{}}".format(root), r"", r"{{}}".format(node))
+                            prefix = re.sub(r"^{{}}".format(os.path.sep), r"", prefix)
                             if prefix:
-                                prefix = re.sub("/", "_", prefix) + "_"
+                                prefix = re.sub(r"{{}}".format(os.path.sep), r"_", prefix) + "_"
                             self.load_sfx_file(os.path.join(node, leaf,), prefix=prefix)
 
     def load_sfx_file(self, path, name=None, replace=False, prefix="",