diff --git a/composer.json b/composer.json
index d7d917c8..f8d38ee8 100644
--- a/composer.json
+++ b/composer.json
@@ -28,6 +28,7 @@
     },
     "require-dev": {
         "ext-json": "*",
+        "larastan/larastan": "^3.3",
         "mockery/mockery": "^1.4",
         "orchestra/testbench": "^7.0|^8.0|^10.0",
         "pestphp/pest": "^2.0|^3.7",
diff --git a/src/Filters/FiltersExact.php b/src/Filters/FiltersExact.php
index b84ad991..5dfcae5a 100644
--- a/src/Filters/FiltersExact.php
+++ b/src/Filters/FiltersExact.php
@@ -67,6 +67,7 @@ protected function withRelationConstraint(Builder $query, mixed $value, string $
             ]);
 
         $query->whereHas($relation, function (Builder $query) use ($property, $value) {
+            /** @var Builder<TModelClass> $query */
             $this->relationConstraints[] = $property = $query->qualifyColumn($property);
 
             $this->__invoke($query, $value, $property);