diff --git a/lib/Db/ShareMapper.php b/lib/Db/ShareMapper.php
index 83ac90e9e..ea43e862e 100644
--- a/lib/Db/ShareMapper.php
+++ b/lib/Db/ShareMapper.php
@@ -104,7 +104,7 @@ public function findByPollUnreminded(int $pollId, bool $getDeleted = false): arr
 
 		$qb->select('*')
 			->from($this->getTableName())
-			->groupBy(self::TABLE . '.id')
+			->groupBy('id')
 			->where($qb->expr()->eq('poll_id', $qb->createNamedParameter($pollId, IQueryBuilder::PARAM_INT)))
 			->andWhere($qb->expr()->eq('reminder_sent', $qb->createNamedParameter(0, IQueryBuilder::PARAM_INT)));