diff --git a/packages/Webkul/Product/src/Repositories/ProductFlatRepository.php b/packages/Webkul/Product/src/Repositories/ProductFlatRepository.php
index 566b5dae2..64e3d8aeb 100644
--- a/packages/Webkul/Product/src/Repositories/ProductFlatRepository.php
+++ b/packages/Webkul/Product/src/Repositories/ProductFlatRepository.php
@@ -76,14 +76,7 @@ class ProductFlatRepository extends Repository
     {
         $qb = $this->categoryProductQuerybuilder($categoryId);
 
-        $productFlatIds   = $qb->pluck('id')->toArray();
-        $productIds       = $qb->pluck('product_flat.product_id')->toArray();
-
-        $childProductIds = $this->model->distinct()
-            ->whereIn('parent_id', $productFlatIds)
-            ->pluck('product_id')->toArray();
-
-        $productIds = array_merge($productIds, $childProductIds);
+        $childQuery = $this->model->distinct()->whereIn('parent_id', $qb->distinct()->select(['id']));
 
         $attributeValues = $this->model
             ->distinct()
@@ -92,7 +85,10 @@ class ProductFlatRepository extends Repository
             ->leftJoin('product_super_attributes as ps', 'product_flat.product_id', 'ps.product_id')
             ->select('pa.integer_value', 'pa.text_value', 'pa.attribute_id', 'ps.attribute_id as attributeId')
             ->where('is_filterable', 1)
-            ->WhereIn('pa.product_id', $productIds)
+            ->where(function ($query) use ($qb,$childQuery){
+                $query->WhereIn('pa.product_id', $qb->distinct()->select(['product_flat.product_id']));
+                $query->orWhereIn('pa.product_id', $childQuery->select(['product_flat.product_id']));
+            })
             ->get();
 
         $attributeInfo['attributeOptions'] =  $attributeInfo['attributes'] = [];