diff --git a/tests/cases/conformance/jsx/tsxGenericAttributesType9.tsx b/tests/cases/conformance/jsx/tsxGenericAttributesType9.tsx
index a9466a4398..32a1af66f8 100644
--- a/tests/cases/conformance/jsx/tsxGenericAttributesType9.tsx
+++ b/tests/cases/conformance/jsx/tsxGenericAttributesType9.tsx
@@ -5,7 +5,7 @@
 
 import React = require('react');
 
-export function makeP<P>(Ctor: React.ComponentClass<P>): React.ComponentClass<P> {
+export function makeP<P>(Ctor: React.ComponentClass<P>) {
 	return class extends React.PureComponent<P, void> {
 		public render(): JSX.Element {
 			return (
@@ -13,4 +13,5 @@ export function makeP<P>(Ctor: React.ComponentClass<P>): React.ComponentClass<P>
 			);
 		}
 	};
-}
\ No newline at end of file
+}
+
diff --git a/tests/cases/conformance/jsx/tsxStatelessFunctionComponentOverload1.tsx b/tests/cases/conformance/jsx/tsxStatelessFunctionComponentOverload1.tsx
index d8897321f0..525d035cbf 100644
--- a/tests/cases/conformance/jsx/tsxStatelessFunctionComponentOverload1.tsx
+++ b/tests/cases/conformance/jsx/tsxStatelessFunctionComponentOverload1.tsx
@@ -38,10 +38,10 @@ declare function TestingOptional(a: {y1: boolean, y2?: number, y3: boolean}): JS
 
 // OK
 const e1 = <TestingOptional />
-const e2 = <TestingOptional extra-prop/>
 const e3 = <TestingOptional y1="hello"/>
 const e4 = <TestingOptional y1="hello" y2={1000} />
 const e5 = <TestingOptional y1 y3/>
 const e6 = <TestingOptional y1 y3 y2={10} />
+const e2 = <TestingOptional y1 y3 extra-prop/>
 
 
diff --git a/tests/lib/react.d.ts b/tests/lib/react.d.ts
index 7f03899eb6..aead9f9f23 100644
--- a/tests/lib/react.d.ts
+++ b/tests/lib/react.d.ts
@@ -159,7 +159,8 @@ declare namespace __React {
     type ReactInstance = Component<any, any> | Element;
 
     // Base component for plain JS classes
-    class Component<P, S> implements ComponentLifecycle<P, S> {
+    interface Component<P, S> extends ComponentLifecycle<P, S> { }
+    class Component<P, S> {
         constructor(props?: P, context?: any);
         setState(f: (prevState: S, props: P) => S, callback?: () => any): void;
         setState(state: S, callback?: () => any): void;