diff --git a/util/buildtoc.py b/util/buildtoc.py
index f98e2c9..7082b33 100644
--- a/util/buildtoc.py
+++ b/util/buildtoc.py
@@ -4,7 +4,7 @@ import re
 
 # get list of chapters
 chapters = []
-for line in open('index.html'):
+for line in open('index.html', encoding="utf-8"):
     if not line.count('<li') or not line.count('<a href'): continue
     chapters.append(line.split('<a href=', 1)[1].split('>', 1)[0])
 sections = {}