diff --git a/oml/media/cbz.py b/oml/media/cbz.py
index 60f0672..a4bcb5b 100644
--- a/oml/media/cbz.py
+++ b/oml/media/cbz.py
@@ -20,7 +20,7 @@ def cover(path):
         return data
     files = [f.filename for f in z.filelist]
     if files:
-        cover = ox.sortedstrings(files)[0]
+        cover = ox.sorted_strings(files)[0]
         try:
             data = z.read(cover)
         except: