diff --git a/src/Services/ProjectSystem/ProjectBuildHelper.php b/src/Services/ProjectSystem/ProjectBuildHelper.php
index ac346284..090f9e66 100644
--- a/src/Services/ProjectSystem/ProjectBuildHelper.php
+++ b/src/Services/ProjectSystem/ProjectBuildHelper.php
@@ -244,7 +244,7 @@ final readonly class ProjectBuildHelper
     private function getBomEntryUnitPrice(ProjectBOMEntry $entry, int $number_of_builds, ?Currency $currency): ?BigDecimal
     {        
         if ($entry->getPart() && $entry->getPart()->getBuiltProject() instanceof Project){
-            return $this->calculateTotalBuildPrice($entry->getPart()->getBuiltProject(), intval($entry->getQuantity()), $entry->getPriceCurrency());
+            return $this->calculateTotalBuildPrice($entry->getPart()->getBuiltProject(), 1, $entry->getPriceCurrency());
         }
         
         if ($entry->getPart() instanceof Part) {
diff --git a/tests/Services/ProjectSystem/ProjectBuildHelperTest.php b/tests/Services/ProjectSystem/ProjectBuildHelperTest.php
index 095e6d95..1e311730 100644
--- a/tests/Services/ProjectSystem/ProjectBuildHelperTest.php
+++ b/tests/Services/ProjectSystem/ProjectBuildHelperTest.php
@@ -219,7 +219,7 @@ final class ProjectBuildHelperTest extends WebTestCase
         $subproject = new Project();
         $subentry = new ProjectBOMEntry();
         $subentry->setPart($this->makePartWithPrice(3.5));
-        $subentry->setQuantity(2);
+        $subentry->setQuantity(3);
         $subproject->addBomEntry($subentry);
 
         $part = new Part();
@@ -229,10 +229,10 @@ final class ProjectBuildHelperTest extends WebTestCase
         $part->setBuiltProject($subproject);
         $project->addBomEntry($entry2);
 
-        // 4 × 1.50 + 2 x (2 x 3.5) = 20.00 for 1 build
+        // 4 × 1.50 + 2 x (3 x 3.5) = 27.00 for 1 build
         $result = $this->service->calculateTotalBuildPrice($project, 1);
         $this->assertNotNull($result);
-        $this->assertTrue(BigDecimal::of('20.00')->isEqualTo($result));
+        $this->assertTrue(BigDecimal::of('27.00')->isEqualTo($result));
     }
     
     public function testCalculateUnitBuildPriceEqualsTotal(): void