diff --git a/ext/handle_video/main.php b/ext/handle_video/main.php
index bb191896..bdde7ea9 100644
--- a/ext/handle_video/main.php
+++ b/ext/handle_video/main.php
@@ -111,7 +111,7 @@ class VideoFileHandler extends DataHandlerExtension {
 				else
 				{
 					$scale = 'scale="' . escapeshellarg("if(gt(a,{$w}/{$h}),{$w},-1)") . ':' . escapeshellarg("if(gt(a,{$w}/{$h}),-1,{$h})") . '"';
-					$cmd = "{$ffmpeg} -y -i {$inname} -vf {$scale} -ss 00:00:00.0 -f image2 -vframes 1 {$outname}";
+					$cmd = escapeshellcmd("{$ffmpeg} -y -i {$inname} -vf {$scale} -ss 00:00:00.0 -f image2 -vframes 1 {$outname}");
 				}
 
 				exec($cmd, $output, $returnValue);