diff --git a/static/client.html b/static/client.html
index 8462e9804..204b91292 100644
--- a/static/client.html
+++ b/static/client.html
@@ -9,6 +9,7 @@
   <title>Karma</title>
   <link href="favicon.ico" rel="icon" type="image/x-icon">
   <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
+  <meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1, user-scalable=no" />
   <style type="text/css">
     iframe {
       height: 100%;
diff --git a/static/context.html b/static/context.html
index 64420c668..faf06c425 100644
--- a/static/context.html
+++ b/static/context.html
@@ -8,6 +8,7 @@
 <head>
   <title></title>
   <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
+  <meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1, user-scalable=no" />
 </head>
 <body>
   <!-- The scripts need to be at the end of body, so that some test running frameworks
diff --git a/static/debug.html b/static/debug.html
index a11f16e58..75891f198 100644
--- a/static/debug.html
+++ b/static/debug.html
@@ -10,6 +10,7 @@
   <title>Karma DEBUG RUNNER</title>
   <link href="favicon.ico" rel="icon" type="image/x-icon" />
   <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
+  <meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1, user-scalable=no" />
 </head>
 <body>
   <!-- The scripts need to be at the end of body, so that some test running frameworks
