diff --git a/src/BackupHandlers/Files/FilesBackupHandler.php b/src/BackupHandlers/Files/FilesBackupHandler.php
index cda8762c..179ca855 100644
--- a/src/BackupHandlers/Files/FilesBackupHandler.php
+++ b/src/BackupHandlers/Files/FilesBackupHandler.php
@@ -65,7 +65,7 @@ public function getAllPathFromFileArray($fileArray)
             }
 
             if (File::isDirectory($file)) {
-                $files += File::allFiles($file);
+                $files = array_merge($files, File::allFiles($file));
             }
         }