diff --git a/comicapi/comicarchive.py b/comicapi/comicarchive.py
index 685aaef..91d5b77 100644
--- a/comicapi/comicarchive.py
+++ b/comicapi/comicarchive.py
@@ -902,7 +902,7 @@ class ComicArchive:
                 def keyfunc(k):
                     return k.lower()
 
-                files = natsort.natsorted(files, alg=natsort.ns.IC | natsort.ns.I)
+                files = natsort.natsorted(files, alg=natsort.ns.IC | natsort.ns.I | natsort.ns.U)
 
             # make a sub-list of image files
             self.page_list = []