diff --git a/howto.js b/howto.js
index cf359eb..7bf9dd2 100644
--- a/howto.js
+++ b/howto.js
@@ -14,7 +14,7 @@ export default ({ navigation: { navigate }, route }) => {
         useWebKit
         source={{ uri: info.replace("http://", "https://") }}
       />
-      <BigButton onPress={onExit} text="閉じる" />
+      <BigButton onPress={onExit} string="閉じる" />
     </View>
   );
 };