diff --git a/jquery/jquery-tests.ts b/jquery/jquery-tests.ts
index 920b95846..2f647c4d1 100644
--- a/jquery/jquery-tests.ts
+++ b/jquery/jquery-tests.ts
@@ -1494,6 +1494,9 @@ function test_eventParams() {
     $('#whichkey').bind('mousedown', function (e) {
         $('#log').html(e.type + ': ' + e.which);
     });
+    $(window).on('mousewheel', (e) => {
+        var delta = (<WheelEvent>e.originalEvent).deltaY;
+    });
 }
 
 function test_extend() {
diff --git a/jquery/jquery.d.ts b/jquery/jquery.d.ts
index eb6ec2e56..e40110c16 100644
--- a/jquery/jquery.d.ts
+++ b/jquery/jquery.d.ts
@@ -548,6 +548,7 @@ interface BaseJQueryEventObject extends Event {
     isImmediatePropagationStopped(): boolean;
     isPropagationStopped(): boolean;
     namespace: string;
+    originalEvent: Event;
     preventDefault(): any;
     relatedTarget: Element;
     result: any;
@@ -585,11 +586,7 @@ interface JQueryKeyEventObject extends JQueryInputEventObject {
     keyCode: number;
 }
 
-interface JQueryPopStateEventObject extends BaseJQueryEventObject {
-    originalEvent: PopStateEvent;
-}
-
-interface JQueryEventObject extends BaseJQueryEventObject, JQueryInputEventObject, JQueryMouseEventObject, JQueryKeyEventObject, JQueryPopStateEventObject {
+interface JQueryEventObject extends BaseJQueryEventObject, JQueryInputEventObject, JQueryMouseEventObject, JQueryKeyEventObject{
 }
 
 /*