diff --git a/baselines/dom.generated.d.ts b/baselines/dom.generated.d.ts
index f32fedc45..632e84b10 100644
--- a/baselines/dom.generated.d.ts
+++ b/baselines/dom.generated.d.ts
@@ -9932,7 +9932,7 @@ declare var NodeList: {
 };
 
 interface NodeListOf<TNode extends Node> extends NodeList {
-    item(index: number): TNode;
+    item(index: number): TNode | null;
     /**
      * Performs the specified action for each node in an list.
      * @param callbackfn  A function that accepts up to three arguments. forEach calls the callbackfn function one time for each element in the list.
diff --git a/inputfiles/addedTypes.jsonc b/inputfiles/addedTypes.jsonc
index 6fe563b02..2fb2d718d 100644
--- a/inputfiles/addedTypes.jsonc
+++ b/inputfiles/addedTypes.jsonc
@@ -473,7 +473,7 @@
                         "item": {
                             "name": "item",
                             "overrideSignatures": [
-                                "item(index: number): TNode"
+                                "item(index: number): TNode | null"
                             ]
                         }
                     }