diff --git a/baselines/dom.generated.d.ts b/baselines/dom.generated.d.ts
index c350f4ea8..8b1891cff 100644
--- a/baselines/dom.generated.d.ts
+++ b/baselines/dom.generated.d.ts
@@ -7625,7 +7625,7 @@ interface HTMLSelectElement extends HTMLElement {
     addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
     removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLSelectElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
     removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-    [index: number]: Element;
+    [name: number]: HTMLOptionElement | HTMLOptGroupElement;
 }
 
 declare var HTMLSelectElement: {
diff --git a/inputfiles/overridingTypes.json b/inputfiles/overridingTypes.json
index 0cf40ea7a..22cb15e49 100644
--- a/inputfiles/overridingTypes.json
+++ b/inputfiles/overridingTypes.json
@@ -1057,6 +1057,9 @@
                     {
                         "name": "select"
                     }
+                ],
+                "override-index-signatures": [
+                    "[name: number]: HTMLOptionElement | HTMLOptGroupElement"
                 ]
             },
             "HTMLDataListElement": {