diff --git a/src/Bundle/ChillPersonBundle/Export/Aggregator/AccompanyingCourseAggregators/DurationAggregator.php b/src/Bundle/ChillPersonBundle/Export/Aggregator/AccompanyingCourseAggregators/DurationAggregator.php
index 5d0b0e87f..f5dc99115 100644
--- a/src/Bundle/ChillPersonBundle/Export/Aggregator/AccompanyingCourseAggregators/DurationAggregator.php
+++ b/src/Bundle/ChillPersonBundle/Export/Aggregator/AccompanyingCourseAggregators/DurationAggregator.php
@@ -38,7 +38,7 @@ final readonly class DurationAggregator implements AggregatorInterface
         match ($data['precision']) {
             'day' => $qb->addSelect('(COALESCE(acp.closingDate, :now) - acp.openingDate)  AS duration_aggregator'),
             'week' => $qb->addSelect('(COALESCE(acp.closingDate, :now) - acp.openingDate) / 7  AS duration_aggregator'),
-            'month' => $qb->addSelect('(EXTRACT (MONTH FROM AGE(COALESCE(acp.closingDate, :now), acp.openingDate)) * 12 +
+            'month' => $qb->addSelect('(EXTRACT (YEAR FROM AGE(COALESCE(acp.closingDate, :now), acp.openingDate)) * 12 +
                     EXTRACT (MONTH FROM AGE(COALESCE(acp.closingDate, :now), acp.openingDate))) AS duration_aggregator'),
             default => throw new \LogicException('precision not supported: '.$data['precision']),
         };