diff --git a/system/src/Grav/Common/Page/Media.php b/system/src/Grav/Common/Page/Media.php
index c4451e08ce..35baab6ab1 100644
--- a/system/src/Grav/Common/Page/Media.php
+++ b/system/src/Grav/Common/Page/Media.php
@@ -110,8 +110,9 @@ public function __construct($path)
                     $types['alternative'][$i] = MediumFactory::scaledFromMedium($alternatives[$max]['file'], $max, $i);
                 }
 
-                foreach ($types['alternative'] as $ratio => $altMedium) {
+                foreach ($types['alternative'] as $altMedium) {
                     if ($altMedium['file'] != $medium) {
+                        $ratio = $altMedium['file']->get('width') / $medium->get('width');
                         $medium->addAlternative($ratio, $altMedium['file']);
                     }
                 }
diff --git a/system/src/Grav/Common/Page/Medium/ImageMedium.php b/system/src/Grav/Common/Page/Medium/ImageMedium.php
index a2bb7b169a..c6c1b71809 100644
--- a/system/src/Grav/Common/Page/Medium/ImageMedium.php
+++ b/system/src/Grav/Common/Page/Medium/ImageMedium.php
@@ -497,7 +497,7 @@ public function __call($method, $args)
         try {
             call_user_func_array([$this->image, $method], $args);
 
-            foreach ($this->alternatives as $ratio => $medium) {
+            foreach ($this->alternatives as $medium) {
                 if (!$medium->image) {
                     $medium->image();
                 }
@@ -509,7 +509,7 @@ public function __call($method, $args)
                 if (isset(self::$magic_resize_actions[$method])) {
                     foreach (self::$magic_resize_actions[$method] as $param) {
                         if (isset($args_copy[$param])) {
-                            $args_copy[$param] = (int) $args_copy[$param] * $ratio;
+                            $args_copy[$param] *= $medium->get('ratio');
                         }
                     }
                 }