diff --git a/src/Bundle/ChillPersonBundle/Export/Aggregator/HouseholdAggregators/ChildrenNumberAggregator.php b/src/Bundle/ChillPersonBundle/Export/Aggregator/HouseholdAggregators/ChildrenNumberAggregator.php
index e013c2f0f..730c570a1 100644
--- a/src/Bundle/ChillPersonBundle/Export/Aggregator/HouseholdAggregators/ChildrenNumberAggregator.php
+++ b/src/Bundle/ChillPersonBundle/Export/Aggregator/HouseholdAggregators/ChildrenNumberAggregator.php
@@ -70,7 +70,7 @@ class ChildrenNumberAggregator implements AggregatorInterface
 
     public function getLabels($key, array $values, $data)
     {
-        return static function (int|string|null $value): string {
+        return static function (null|int|string $value): string {
             if ('_header' === $value) {
                 return 'Number of children';
             }