diff --git a/core/templates/layout.base.php b/core/templates/layout.base.php
index ea10c3042b592f7f192d9723be89e68493a14e6e..8caa9a0bbea67d93a72eff9d4598b69519d80061 100644
--- a/core/templates/layout.base.php
+++ b/core/templates/layout.base.php
@@ -11,6 +11,7 @@
 		<?php p($theme->getTitle()); ?>
 		</title>
 		<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
+		<meta name="viewport" content="width=device-width; initial-scale=1.0;">
 		<link rel="shortcut icon" href="<?php print_unescaped(image_path('', 'favicon.png')); ?>" />
 		<link rel="apple-touch-icon-precomposed" href="<?php print_unescaped(image_path('', 'favicon-touch.png')); ?>" />
 		<?php foreach ($_['cssfiles'] as $cssfile): ?>
diff --git a/core/templates/layout.guest.php b/core/templates/layout.guest.php
index 9c9eb63382fff615bb93777b226c6570f94e9e89..cecd97ace27c2f8b683f19187335db3db33caa12 100644
--- a/core/templates/layout.guest.php
+++ b/core/templates/layout.guest.php
@@ -11,6 +11,7 @@
 		<?php p($theme->getTitle()); ?>
 		</title>
 		<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
+		<meta name="viewport" content="width=device-width; initial-scale=1.0;">
 		<meta name="apple-itunes-app" content="app-id=543672169">
 		<link rel="shortcut icon" href="<?php print_unescaped(image_path('', 'favicon.png')); ?>" />
 		<link rel="apple-touch-icon-precomposed" href="<?php print_unescaped(image_path('', 'favicon-touch.png')); ?>" />
diff --git a/core/templates/layout.user.php b/core/templates/layout.user.php
index 71bec11d219b7bfb342a413f76b729f8a8e3095c..8d0ea7173535ed40d2e777b19dc4b9e3762dbfc2 100644
--- a/core/templates/layout.user.php
+++ b/core/templates/layout.user.php
@@ -14,6 +14,7 @@
 		</title>
 		<meta charset="utf-8">
 		<meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1">
+		<meta name="viewport" content="width=device-width; initial-scale=1.0;">
 		<meta name="apple-itunes-app" content="app-id=543672169">
 		<link rel="shortcut icon" href="<?php print_unescaped(image_path('', 'favicon.png')); ?>" />
 		<link rel="apple-touch-icon-precomposed" href="<?php print_unescaped(image_path('', 'favicon-touch.png')); ?>" />