diff --git a/tests/Models/NullWorkflowInstanceAbstractTest.php b/tests/Models/NullWorkflowInstanceAbstractTest.php
index 8efa2a4..551a639 100644
--- a/tests/Models/NullWorkflowInstanceAbstractTest.php
+++ b/tests/Models/NullWorkflowInstanceAbstractTest.php
@@ -37,7 +37,7 @@ final class NullWorkflowInstanceAbstractTest extends \PHPUnit\Framework\TestCase
     public function testId() : void
     {
         $null = new NullWorkflowInstanceAbstract(2);
-        self::assertEquals(2, $null->getId());
+        self::assertEquals(2, $null->id);
     }
 
     /**
diff --git a/tests/Models/NullWorkflowTemplateTest.php b/tests/Models/NullWorkflowTemplateTest.php
index 4b14c9f..db6be93 100644
--- a/tests/Models/NullWorkflowTemplateTest.php
+++ b/tests/Models/NullWorkflowTemplateTest.php
@@ -37,7 +37,7 @@ final class NullWorkflowTemplateTest extends \PHPUnit\Framework\TestCase
     public function testId() : void
     {
         $null = new NullWorkflowTemplate(2);
-        self::assertEquals(2, $null->getId());
+        self::assertEquals(2, $null->id);
     }
 
     /**