diff --git a/lib/private/Comments/Manager.php b/lib/private/Comments/Manager.php
index 309b682767b027b94b1c6b1faec77655172669bf..5b256c379b62b6ae068f4de03e7f7a240bb29500 100644
--- a/lib/private/Comments/Manager.php
+++ b/lib/private/Comments/Manager.php
@@ -159,7 +159,7 @@ class Manager implements ICommentsManager {
 		if ($comment->getParentId() === '0') {
 			return $comment->getId();
 		} else {
-			return $this->determineTopmostParentId($comment->getId());
+			return $this->determineTopmostParentId($comment->getParentId());
 		}
 	}