diff --git a/types/jquery/index.d.ts b/types/jquery/index.d.ts
index b71bfbbed3..254a2676ed 100644
--- a/types/jquery/index.d.ts
+++ b/types/jquery/index.d.ts
@@ -2422,7 +2422,7 @@ interface JQueryStatic<TElement extends Node = HTMLElement> {
      * @since 1.4.3
      */
     cssNumber: JQuery.PlainObject<boolean>;
-    readonly fn: JQuery<TElement>;
+    fn: JQuery<TElement>;
     fx: {
         /**
          * The rate (in milliseconds) at which animations fire.