diff --git a/lisp/org-roam-review.el b/lisp/org-roam-review.el
index ffff402..efdba98 100644
--- a/lisp/org-roam-review.el
+++ b/lisp/org-roam-review.el
@@ -329,7 +329,7 @@ When called with a `C-u' prefix arg, clear the current filter."
   (replace-regexp-in-string (rx bol) (make-string (* depth org-roam-review-indent-width) 32)
                             str))
 
-(cl-defun org-roam-review-insert-preview (node &optional (depth 0))
+(cl-defun org-roam-review-insert-preview (node &key (depth 0))
   (magit-insert-section section (org-roam-preview-section)
     (let* ((start (org-roam-node-point node))
            (file (org-roam-node-file node))