diff --git a/src/PhpParser/Node/Manipulator/PropertyManipulator.php b/src/PhpParser/Node/Manipulator/PropertyManipulator.php
index e7b01cbd2a6..70b3d5f31b7 100644
--- a/src/PhpParser/Node/Manipulator/PropertyManipulator.php
+++ b/src/PhpParser/Node/Manipulator/PropertyManipulator.php
@@ -151,12 +151,14 @@ final class PropertyManipulator
         return $this->getProperty($propertyProperty)->isPrivate();
     }
 
-    protected function getProperty(PropertyProperty $propertyProperty): Property
+    private function getProperty(PropertyProperty $propertyProperty): Property
     {
         $property = $propertyProperty->getAttribute(AttributeKey::PARENT_NODE);
+
         if (! $property instanceof Property) {
             throw new ShouldNotHappenException('PropertyProperty should always have Property as parent');
         }
+
         return $property;
     }