diff --git a/src/Utils/ArrayDiff.php b/src/Utils/ArrayDiff.php
index 31d5a16b..ca137654 100644
--- a/src/Utils/ArrayDiff.php
+++ b/src/Utils/ArrayDiff.php
@@ -55,13 +55,13 @@ public function diff($oldData, $newData)
      * Compare the type and the property values of two objects.
      * Return true if they are the same, false otherwise.
      * If the type is the same and all properties are the same, this will return true, even if they are not the same instance.
+     *
+     * @see https://www.php.net/manual/en/language.oop5.object-comparison.php.
      */
-    public function compareObjects(object $object1, object $object2): bool
+    private function compareObjects(object $object1, object $object2): bool
     {
         // Check if the objects are of the same type.
-        $obj1Class = $object1::class;
-        $obj2Class = $object2::class;
-        if ($obj1Class !== $obj2Class) {
+        if ($object1::class !== $object2::class) {
             return false;
         }
 
@@ -76,6 +76,7 @@ public function compareObjects(object $object1, object $object2): bool
                 if (!$this->compareObjects($value, $obj2Properties[$key])) {
                     return false;
                 }
+
                 continue;
             }
             if ($value !== $obj2Properties[$key]) {
diff --git a/tests/Utils/ArrayDiffTest.php b/tests/Utils/ArrayDiffTest.php
index 5d8e000f..e3c5b960 100644
--- a/tests/Utils/ArrayDiffTest.php
+++ b/tests/Utils/ArrayDiffTest.php
@@ -16,7 +16,7 @@
 use PHPUnit\Framework\TestCase;
 use SimpleThings\EntityAudit\Utils\ArrayDiff;
 
-class ArrayDiffTest extends TestCase
+final class ArrayDiffTest extends TestCase
 {
     public function testDiff(): void
     {