diff --git a/src/Faker/Provider/Image.php b/src/Faker/Provider/Image.php
index 0def1371bc..0e31d50fae 100644
--- a/src/Faker/Provider/Image.php
+++ b/src/Faker/Provider/Image.php
@@ -19,9 +19,15 @@ class Image extends Base
      *
      * @example 'http://lorempixel.com/640/480/?12345'
      */
-    public static function imageUrl($width = 640, $height = 480, $category = null, $randomize = true, $word = null)
+    public static function imageUrl($width = 640, $height = 480, $category = null, $randomize = true, $word = null, $gray = false)
     {
-        $url = "http://lorempixel.com/{$width}/{$height}/";
+        $baseUrl = "http://lorempixel.com/";
+        $url = "{$width}/{$height}/";
+        
+        if ($gray) {
+            $url = "gray/" . $url;
+        }
+        
         if ($category) {
             if (!in_array($category, static::$categories)) {
                 throw new \InvalidArgumentException(sprintf('Unknown image category "%s"', $category));
@@ -36,7 +42,7 @@ public static function imageUrl($width = 640, $height = 480, $category = null, $
             $url .= '?' . static::randomNumber(5, true);
         }
 
-        return $url;
+        return $baseUrl . $url;
     }
 
     /**