diff --git a/src/FFMpeg/Filters/Video/ExtractMultipleFramesFilter.php b/src/FFMpeg/Filters/Video/ExtractMultipleFramesFilter.php
index b0998ff..2c4b9cb 100644
--- a/src/FFMpeg/Filters/Video/ExtractMultipleFramesFilter.php
+++ b/src/FFMpeg/Filters/Video/ExtractMultipleFramesFilter.php
@@ -77,7 +77,6 @@ class ExtractMultipleFramesFilter implements VideoFilterInterface
      */
     public function apply(Video $video, VideoInterface $format)
     {
-        $dimensions = null;
         $commands = array();
 
         try {