diff --git a/react/react-addons-test-utils.d.ts b/react/react-addons-test-utils.d.ts
index 8bf50366e9..9807300ff4 100644
--- a/react/react-addons-test-utils.d.ts
+++ b/react/react-addons-test-utils.d.ts
@@ -6,7 +6,22 @@
 /// <reference path="react.d.ts" />
 
 declare namespace __React {
-    interface SyntheticEventData {
+    interface OptionalEventProperties {
+        bubbles?: boolean;
+        cancelable?: boolean;
+        currentTarget?: EventTarget;
+        defaultPrevented?: boolean;
+        eventPhase?: number;
+        isTrusted?: boolean;
+        nativeEvent?: Event;
+        preventDefault?(): void;
+        stopPropagation?(): void;
+        target?: EventTarget;
+        timeStamp?: Date;
+        type?: string;
+    }
+
+    interface SyntheticEventData extends OptionalEventProperties {
         altKey?: boolean;
         button?: number;
         buttons?: number;
@@ -41,8 +56,7 @@ declare namespace __React {
     }
 
     interface EventSimulator {
-        (element: Element, eventData?: SyntheticEventData): void;
-        (component: Component<any, any>, eventData?: SyntheticEventData): void;
+        (element: Element | Component<any, any>, eventData?: SyntheticEventData): void;
     }
 
     interface MockedComponentClass {
diff --git a/react/react-global-tests.ts b/react/react-global-tests.ts
index 3aaf4b2c1f..1ed7f8484e 100644
--- a/react/react-global-tests.ts
+++ b/react/react-global-tests.ts
@@ -418,9 +418,10 @@ React.createClass({
 // TestUtils addon
 // --------------------------------------------------------------------------
 var node: Element;
+
 React.addons.TestUtils.Simulate.click(node);
 React.addons.TestUtils.Simulate.change(node);
-React.addons.TestUtils.Simulate.keyDown(node, { key: "Enter" });
+React.addons.TestUtils.Simulate.keyDown(node, { key: "Enter", cancelable: false });
 
 var renderer: React.ShallowRenderer =
     React.addons.TestUtils.createRenderer();
diff --git a/react/react-tests.ts b/react/react-tests.ts
index dc0a409dcf..5976fb23bd 100644
--- a/react/react-tests.ts
+++ b/react/react-tests.ts
@@ -553,7 +553,7 @@ var node: Element = TestUtils.renderIntoDocument(React.DOM.div());
 
 TestUtils.Simulate.click(node);
 TestUtils.Simulate.change(node);
-TestUtils.Simulate.keyDown(node, { key: "Enter" });
+TestUtils.Simulate.keyDown(node, { key: "Enter", cancelable: false });
 
 var renderer: React.ShallowRenderer =
     TestUtils.createRenderer();