diff --git a/src/Filters/GlobalFilter.php b/src/Filters/GlobalFilter.php
index ad034a9..1f0f316 100644
--- a/src/Filters/GlobalFilter.php
+++ b/src/Filters/GlobalFilter.php
@@ -5,7 +5,6 @@
 use Illuminate\Contracts\Database\Query\Expression;
 use Illuminate\Database\Eloquent\Builder;
 use Illuminate\Support\Collection;
-use Kirschbaum\PowerJoins\FakeJoinCallback;
 use Spatie\QueryBuilder\AllowedFilter;
 use Spatie\QueryBuilder\Filters\Filter;
 use TeamQ\QueryBuilder\Concerns\HasPropertyRelationship;
@@ -34,7 +33,7 @@ class GlobalFilter implements Filter
     public function __construct(
         array $fields,
         bool $addRelationConstraint = true,
-        JoinType $joinType = null,
+        ?JoinType $joinType = null,
         array|string|null $joinAliases = null
     ) {
         $this->fields = $fields;
@@ -49,7 +48,7 @@ public function __construct(
     public static function allowed(
         array $fields,
         bool $addRelationConstraint = true,
-        JoinType $joinType = null,
+        ?JoinType $joinType = null,
         string $name = 'global',
     ): AllowedFilter {
         return AllowedFilter::custom($name, new static($fields, $addRelationConstraint, $joinType));
diff --git a/tests/Sorts/RelationSortTest.php b/tests/Sorts/RelationSortTest.php
index e0fcc36..267994d 100644
--- a/tests/Sorts/RelationSortTest.php
+++ b/tests/Sorts/RelationSortTest.php
@@ -170,7 +170,7 @@
         ]);
 
     expect($queryBuilder->toSql())
-        ->toBe("select `books`.*, sum(chapters_alias.number) as chapters_alias_number_sum from `books` left join `chapters` as `chapters_alias` on `chapters_alias`.`book_id` = `books`.`id` group by `books`.`id` order by chapters_alias_number_sum desc")
+        ->toBe('select `books`.*, sum(chapters_alias.number) as chapters_alias_number_sum from `books` left join `chapters` as `chapters_alias` on `chapters_alias`.`book_id` = `books`.`id` group by `books`.`id` order by chapters_alias_number_sum desc')
         ->and($queryBuilder->get())
         ->sequence(
             fn ($book) => $book->title->toBe('Laravel Beyond Crud'),
@@ -194,7 +194,7 @@
         ]);
 
     expect($queryBuilder->toSql())
-        ->toBe("select `countries`.* from `countries` inner join `authors` as `authors_alias` on `authors_alias`.`country_id` = `countries`.`id` inner join `books` as `books_alias` on `books_alias`.`author_id` = `authors_alias`.`id` order by `books_alias`.`order` asc")
+        ->toBe('select `countries`.* from `countries` inner join `authors` as `authors_alias` on `authors_alias`.`country_id` = `countries`.`id` inner join `books` as `books_alias` on `books_alias`.`author_id` = `authors_alias`.`id` order by `books_alias`.`order` asc')
         ->and($queryBuilder->get())
         ->sequence(
             fn ($country) => $country->code->toBe('US'),