diff --git a/nextrip.php b/nextrip.php
index ced3803..0691979 100644
--- a/nextrip.php
+++ b/nextrip.php
@@ -121,13 +121,13 @@
 
 					$favorites[$favSet] = $desc;
 					ksort($favorites);
-					setcookie("favorites", json_encode($favorites));
+					setcookie("favorites", json_encode($favorites), 2147483647);
 					echo "<div class=\"alert alert-info\">{$favSet}({$desc})は設定しました。</div>";
 				} else if(isset($favRemove)) { // お気に入りから削除
 					if(array_key_exists($favRemove, $favorites)) {
 						$desc = $favorites[$favRemove];
 						unset($favorites[$favRemove]);
-						setcookie("favorites", json_encode($favorites));
+						setcookie("favorites", json_encode($favorites), 2147483647);
 						echo "<div class=\"alert alert-info\">{$favRemove}({$desc})は削除しました。</div>";
 					} else {
 						echo "<div class=\"alert alert-warning\">{$favRemove}はお気に入りにありません。</div>";