diff --git a/lib/classes/databox.php b/lib/classes/databox.php
index a765bb4440..8a60d992b7 100644
--- a/lib/classes/databox.php
+++ b/lib/classes/databox.php
@@ -445,6 +445,21 @@ class databox extends base
 
     public function unmount_databox()
     {
+        if ($this->app['phraseanet.static-file-factory']->isStaticFileModeEnabled()) {
+            $sql = "SELECT path, file FROM subdef WHERE `name`='thumbnail'";
+            $stmt = $this->get_connection()->prepare($sql);
+            $stmt->execute();
+            $rows = $stmt->fetchAll(\PDO::FETCH_ASSOC);
+            $stmt->closeCursor();
+            foreach ($rows as $row) {
+                $pathfile = $this->app['phraseanet.thumb-symlinker']->getSymlinkPath(sprintf(
+                    '%s/%s',
+                    rtrim($row['path'], '/'),
+                    $row['file']
+                ));
+                $this->app['filesystem']->remove($pathfile);
+            }
+        }
         foreach ($this->get_collections() as $collection) {
             $collection->unmount_collection($this->app);
         }