diff --git a/baselines/dom.generated.d.ts b/baselines/dom.generated.d.ts
index 4f39009f2..6ba4d7f64 100644
--- a/baselines/dom.generated.d.ts
+++ b/baselines/dom.generated.d.ts
@@ -8602,7 +8602,7 @@ interface MouseEvent extends UIEvent {
     readonly x: number;
     readonly y: number;
     getModifierState(keyArg: string): boolean;
-    initMouseEvent(typeArg: string, canBubbleArg: boolean, cancelableArg: boolean, viewArg: Window, detailArg: number, screenXArg: number, screenYArg: number, clientXArg: number, clientYArg: number, ctrlKeyArg: boolean, altKeyArg: boolean, shiftKeyArg: boolean, metaKeyArg: boolean, buttonArg: number, relatedTargetArg: EventTarget): void;
+    initMouseEvent(typeArg: string, canBubbleArg: boolean, cancelableArg: boolean, viewArg: Window, detailArg: number, screenXArg: number, screenYArg: number, clientXArg: number, clientYArg: number, ctrlKeyArg: boolean, altKeyArg: boolean, shiftKeyArg: boolean, metaKeyArg: boolean, buttonArg: number, relatedTargetArg: EventTarget | null): void;
 }
 
 declare var MouseEvent: {
diff --git a/inputfiles/overridingTypes.json b/inputfiles/overridingTypes.json
index 9bae25e5d..ffab8ea3f 100644
--- a/inputfiles/overridingTypes.json
+++ b/inputfiles/overridingTypes.json
@@ -887,5 +887,11 @@
         "readonly": true,
         "name": "parentElement",
         "type": "HTMLElement | null"
+    },
+    {
+        "kind": "method",
+        "interface": "MouseEvent",
+        "name": "initMouseEvent",
+        "signatures": ["initMouseEvent(typeArg: string, canBubbleArg: boolean, cancelableArg: boolean, viewArg: Window, detailArg: number, screenXArg: number, screenYArg: number, clientXArg: number, clientYArg: number, ctrlKeyArg: boolean, altKeyArg: boolean, shiftKeyArg: boolean, metaKeyArg: boolean, buttonArg: number, relatedTargetArg: EventTarget | null): void"]
     }
  ]