diff --git a/baselines/dom.generated.d.ts b/baselines/dom.generated.d.ts
index 106c56d63..0e3c14daf 100644
--- a/baselines/dom.generated.d.ts
+++ b/baselines/dom.generated.d.ts
@@ -14173,6 +14173,11 @@ interface PromiseRejectionEvent extends Event {
     readonly reason: any;
 }
 
+declare var PromiseRejectionEvent: {
+    prototype: PromiseRejectionEvent;
+    new(type: string, promiseRejectionEventInitDict?: PromiseRejectionEventInit): PromiseRejectionEvent;
+}
+
 interface PromiseRejectionEventInit extends EventInit {
     promise: PromiseLike<any>;
     reason?: any;
diff --git a/inputfiles/addedTypes.json b/inputfiles/addedTypes.json
index 14e8a98ba..7e944e684 100644
--- a/inputfiles/addedTypes.json
+++ b/inputfiles/addedTypes.json
@@ -1512,7 +1512,10 @@
             "name": "reason",
             "type": "any",
             "readonly": true
-        }]
+        }],
+        "constructorSignatures": [
+            "new(type: string, promiseRejectionEventInitDict?: PromiseRejectionEventInit): PromiseRejectionEvent"
+        ]
     },
     {
         "kind": "interface",