diff --git a/rules-tests/DeadCode/Rector/ClassMethod/RemoveParentDelegatingConstructorRector/Fixture/skip_parent_does_not_has_default_param.php.inc b/rules-tests/DeadCode/Rector/ClassMethod/RemoveParentDelegatingConstructorRector/Fixture/skip_parent_does_not_has_default_param.php.inc
new file mode 100644
index 00000000000..57be0e36c98
--- /dev/null
+++ b/rules-tests/DeadCode/Rector/ClassMethod/RemoveParentDelegatingConstructorRector/Fixture/skip_parent_does_not_has_default_param.php.inc
@@ -0,0 +1,13 @@
+<?php
+
+namespace Rector\Tests\DeadCode\Rector\ClassMethod\RemoveParentDelegatingConstructorRector\Fixture;
+
+use Rector\Tests\DeadCode\Rector\ClassMethod\RemoveParentDelegatingConstructorRector\Source\SomeParentWithoutDefaultParam;
+
+final class SkipParentDoesNotHasDefaultParam extends SomeParentWithoutDefaultParam
+{
+    public function __construct(array $value = [])
+    {
+        parent::__construct($value);
+    }
+}
diff --git a/rules-tests/DeadCode/Rector/ClassMethod/RemoveParentDelegatingConstructorRector/Source/SomeParentWithoutDefaultParam.php b/rules-tests/DeadCode/Rector/ClassMethod/RemoveParentDelegatingConstructorRector/Source/SomeParentWithoutDefaultParam.php
new file mode 100644
index 00000000000..be2e96244c1
--- /dev/null
+++ b/rules-tests/DeadCode/Rector/ClassMethod/RemoveParentDelegatingConstructorRector/Source/SomeParentWithoutDefaultParam.php
@@ -0,0 +1,12 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Rector\Tests\DeadCode\Rector\ClassMethod\RemoveParentDelegatingConstructorRector\Source;
+
+class SomeParentWithoutDefaultParam
+{
+    public function __construct(array $value)
+    {
+    }
+}
diff --git a/rules/DeadCode/Rector/ClassMethod/RemoveParentDelegatingConstructorRector.php b/rules/DeadCode/Rector/ClassMethod/RemoveParentDelegatingConstructorRector.php
index c5d610c23ad..a767513b730 100644
--- a/rules/DeadCode/Rector/ClassMethod/RemoveParentDelegatingConstructorRector.php
+++ b/rules/DeadCode/Rector/ClassMethod/RemoveParentDelegatingConstructorRector.php
@@ -265,6 +265,12 @@ private function isDifferentDefaultValue(
                 return false;
             }
 
+            // when child has default value, but parent does not have default value,
+            // mark as different
+            if (! $nativeParentParameterReflection->isDefaultValueAvailable()) {
+                return true;
+            }
+
             $parentDefault = $nativeParentParameterReflection->getDefaultValue();
             if (! $this->valueResolver->isValue($defaultExpr, $parentDefault)) {
                 return true;