diff --git a/pppadump/commands/index.py b/pppadump/commands/index.py
index 129cfad..9c788a0 100644
--- a/pppadump/commands/index.py
+++ b/pppadump/commands/index.py
@@ -275,7 +275,7 @@ def main (args):
 
         if "text" in versions_by_type:
             try:
-                with open (versions_by_type["text"]["path"]) as f:
+                with open (versions_by_type["text"]["path"], encoding="utf-8") as f:
                     p["text"] = f.read()
             except FileNotFoundError:
                 p['text'] = ''
@@ -320,7 +320,7 @@ def main (args):
 
 
     if args.output:
-        with open(args.output, "w") as f:
+        with open(args.output, "w", encoding="utf-8") as f:
             print (template.render(vars(args)), file=f)
     else:
         print (template.render(vars(args)))