diff --git a/lisp/org-macs.el b/lisp/org-macs.el
index 73ef68ba1..402226025 100644
--- a/lisp/org-macs.el
+++ b/lisp/org-macs.el
@@ -1116,7 +1116,9 @@ Return width in pixels when PIXELS is non-nil."
                  result)))
           (current-char-property-alias-alist char-property-alias-alist))
       (with-current-buffer (get-buffer-create " *Org string width*")
-        (setq-local display-line-numbers nil)
+        (setq-local display-line-numbers nil
+                    line-prefix nil
+                    wrap-prefix nil)
         (setq-local buffer-invisibility-spec
                     (if (listp current-invisibility-spec)
                         (mapcar (lambda (el)