diff --git a/src/Telegram/Types/Inline/Query/Result/Gif.php b/src/Telegram/Types/Inline/Query/Result/Gif.php
index 8221fec..8ee3e78 100644
--- a/src/Telegram/Types/Inline/Query/Result/Gif.php
+++ b/src/Telegram/Types/Inline/Query/Result/Gif.php
@@ -42,6 +42,12 @@ class Gif extends Result
      */
     public $gif_height = 0;
 
+    /**
+     * Optional. Duration of the GIF
+     * @var int
+     */
+    public $gif_duration = 0;
+
     /**
      * URL of the static thumbnail for the result (jpeg or gif)
      * @var string
diff --git a/src/Telegram/Types/Inline/Query/Result/Mpeg4Gif.php b/src/Telegram/Types/Inline/Query/Result/Mpeg4Gif.php
index 3425267..15545dc 100644
--- a/src/Telegram/Types/Inline/Query/Result/Mpeg4Gif.php
+++ b/src/Telegram/Types/Inline/Query/Result/Mpeg4Gif.php
@@ -42,6 +42,12 @@ class Mpeg4Gif extends Result
      */
     public $mpeg4_height = 0;
 
+    /**
+     * Optional. Video duration
+     * @var int
+     */
+    public $mpeg4_duration = 0;
+
     /**
      * URL of the thumbnail for the photo
      * @var string