diff --git a/os/emscripten/shell.html b/os/emscripten/shell.html
index d6c96a6c5e..667027a857 100644
--- a/os/emscripten/shell.html
+++ b/os/emscripten/shell.html
@@ -3,6 +3,7 @@
   <head>
     <meta charset="utf-8">
     <meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+    <meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=no">
     <title>OpenTTD</title>
     <link rel="manifest" href="openttd.webapp">
     <link rel="icon" href="openttd.256.png">
