diff --git a/src/Module/Api/Mastodon/Search.php b/src/Module/Api/Mastodon/Search.php
index 463c0eb6d..b964b35db 100644
--- a/src/Module/Api/Mastodon/Search.php
+++ b/src/Module/Api/Mastodon/Search.php
@@ -181,7 +181,7 @@ class Search extends BaseApi
 
 		$params = ['order' => ['name'], 'limit' => [$offset, $limit]];
 
-		$condition = ["`id` IN (SELECT `tid` FROM `post-tag` WHERE `type` = ? AND `tid` = `id`) AND `name` LIKE ?", Tag::HASHTAG, $q . '%'];
+		$condition = ["EXISTS(SELECT `tid` FROM `post-tag` WHERE `type` = ? AND `tid` = `id`) AND `name` LIKE ?", Tag::HASHTAG, $q . '%'];
 
 		$tags = DBA::select('tag', ['name'], $condition, $params);