diff --git a/src/CascaderTypes.tsx b/src/CascaderTypes.tsx
index d6d1263..fd50718 100644
--- a/src/CascaderTypes.tsx
+++ b/src/CascaderTypes.tsx
@@ -1,3 +1,5 @@
+import * as React from 'react';
+
 export type CascaderOneValue = string | number;
 export type CascaderValue = CascaderOneValue[];