diff --git a/library/Icinga/Util/DirectoryIterator.php b/library/Icinga/Util/DirectoryIterator.php
index a2bed1c27..cee37b6b5 100644
--- a/library/Icinga/Util/DirectoryIterator.php
+++ b/library/Icinga/Util/DirectoryIterator.php
@@ -140,6 +140,7 @@ class DirectoryIterator implements RecursiveIterator
 
     public function next(): void
     {
+        $path = null;
         do {
             $this->files->next();
             $skip = false;