diff --git a/docs/test.html b/docs/test.html
index 27cce742..7019c498 100644
--- a/docs/test.html
+++ b/docs/test.html
@@ -25,7 +25,7 @@
googletag.pubads().addEventListener('rewardedSlotReady',
function(evt) {
- if (confirm('リワード広告を表示しますか?'')) {
+ if (confirm('リワード広告を表示しますか?')) {
evt.makeRewardedVisible();