diff --git a/core/templates/layout.base.php b/core/templates/layout.base.php
index 8cd237deea1..bae52a73234 100644
--- a/core/templates/layout.base.php
+++ b/core/templates/layout.base.php
@@ -11,7 +11,7 @@
 		<?php p($theme->getTitle()); ?>
 		</title>
 		<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
-		<meta name="viewport" content="width=device-width, initial-scale=1.0">
+		<meta name="viewport" content="width=device-width, minimum-scale=1.0, maximum-scale=1.0">
 		<link rel="shortcut icon" href="<?php print_unescaped(image_path('', 'favicon.png')); ?>" />
 		<link rel="apple-touch-icon-precomposed" href="<?php print_unescaped(image_path('', 'favicon-touch.png')); ?>" />
 		<?php foreach ($_['cssfiles'] as $cssfile): ?>
diff --git a/core/templates/layout.guest.php b/core/templates/layout.guest.php
index 47ca5903dab..6a96b17b100 100644
--- a/core/templates/layout.guest.php
+++ b/core/templates/layout.guest.php
@@ -11,7 +11,7 @@
 		<?php p($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="viewport" content="width=device-width, minimum-scale=1.0, maximum-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')); ?>" />