diff --git a/src/ImageSizer.php b/src/ImageSizer.php
index 096d0b7..85eb14a 100644
--- a/src/ImageSizer.php
+++ b/src/ImageSizer.php
@@ -2,6 +2,8 @@
 
 namespace Drupal\image_field_repair;
 
+use Drupal\Core\StreamWrapper\LocalStream;
+
 /**
  * Helper for get image size.
  */
@@ -15,6 +17,11 @@ class ImageSizer {
   private static $fastImage;
 
   /**
+   * @var \Drupal\Core\StreamWrapper\StreamWrapperManagerInterface
+   */
+  private static $stream_wrapper_manager;
+
+  /**
    * Returns size of image.
    *
    * @param string $uri
@@ -27,21 +34,24 @@ class ImageSizer {
   public static function getSize($uri) {
     if (!static::$fastImage) {
       static::$fastImage = new FastImage();
+      static::$stream_wrapper_manager = \Drupal::service('stream_wrapper_manager');
     }
 
     if ($uri[0] === '/' && $uri[1] === '/') {
       $uri = 'http:' . $uri;
     }
 
-    if ($stream_wrapper_manager = \Drupal::service('stream_wrapper_manager')->getViaUri($uri)) {
-      return @getimagesize($stream_wrapper_manager->realpath());
+    $size = FALSE;
+    if (static::$stream_wrapper_manager->getViaUri($uri) instanceof LocalStream) {
+      $size = @getimagesize($uri);
     }
 
-    @static::$fastImage->load($uri);
-
-    $size = @static::$fastImage->getSize();
     if (!$size) {
-      $size = @getimagesize($uri);
+      @static::$fastImage->load($uri);
+      $size = @static::$fastImage->getSize();
+      if (!$size) {
+        $size = @getimagesize($uri);
+      }
     }
     return $size;
   }