diff --git a/lisp/isearch.el b/lisp/isearch.el
index a6978a4c164..82d64c5766b 100644
--- a/lisp/isearch.el
+++ b/lisp/isearch.el
@@ -362,7 +362,7 @@ This setting only has effect when the search string is less than
   "For search strings at least this long, lazy highlight starts immediately.
 For shorter search strings, `lazy-highlight-initial-delay'
 applies."
-  :type 'number
+  :type 'integer
   :group 'lazy-highlight
   :version "28.1")