diff --git a/app/index.html b/app/index.html
index 8c3858e9..ec9246c6 100644
--- a/app/index.html
+++ b/app/index.html
@@ -2,6 +2,7 @@
 <html>
   <head>
     <title>HyperTerm</title>
+    <meta charset="utf-8" />
     <meta name="viewport" content="initial-scale=1.0" />
     <style>
       body {
