diff --git a/rules-tests/DowngradePhp80/Rector/ClassMethod/DowngradeStringReturnTypeOnToStringRector/Fixture/skip_parent_mixed_return.php.inc b/rules-tests/DowngradePhp80/Rector/ClassMethod/DowngradeStringReturnTypeOnToStringRector/Fixture/skip_parent_mixed_return.php.inc
deleted file mode 100644
index c9f5c2f0..00000000
--- a/rules-tests/DowngradePhp80/Rector/ClassMethod/DowngradeStringReturnTypeOnToStringRector/Fixture/skip_parent_mixed_return.php.inc
+++ /dev/null
@@ -1,13 +0,0 @@
-<?php
-
-namespace Rector\Tests\DowngradePhp80\Rector\ClassMethod\DowngradeStringReturnTypeOnToStringRector\Fixture;
-
-use Rector\Tests\DowngradePhp80\Rector\ClassMethod\DowngradeStringReturnTypeOnToStringRector\Source\ParentClassWithToStringMixedReturn;
-
-class SkipParentMixedReturn extends ParentClassWithToStringMixedReturn
-{
-    public function __toString()
-    {
-        return 'value';
-    }
-}
diff --git a/rules-tests/DowngradePhp80/Rector/ClassMethod/DowngradeStringReturnTypeOnToStringRector/Fixture/with_parent_mixed_return.php.inc b/rules-tests/DowngradePhp80/Rector/ClassMethod/DowngradeStringReturnTypeOnToStringRector/Fixture/with_parent_mixed_return.php.inc
new file mode 100644
index 00000000..ae372f95
--- /dev/null
+++ b/rules-tests/DowngradePhp80/Rector/ClassMethod/DowngradeStringReturnTypeOnToStringRector/Fixture/with_parent_mixed_return.php.inc
@@ -0,0 +1,33 @@
+<?php
+
+namespace Rector\Tests\DowngradePhp80\Rector\ClassMethod\DowngradeStringReturnTypeOnToStringRector\Fixture;
+
+use Rector\Tests\DowngradePhp80\Rector\ClassMethod\DowngradeStringReturnTypeOnToStringRector\Source\ParentClassWithToStringMixedReturn;
+
+// @see https://3v4l.org/IrE2q#v7.4.33
+class WithParentMixedReturn extends ParentClassWithToStringMixedReturn
+{
+    public function __toString()
+    {
+        return 'value';
+    }
+}
+
+?>
+-----
+<?php
+
+namespace Rector\Tests\DowngradePhp80\Rector\ClassMethod\DowngradeStringReturnTypeOnToStringRector\Fixture;
+
+use Rector\Tests\DowngradePhp80\Rector\ClassMethod\DowngradeStringReturnTypeOnToStringRector\Source\ParentClassWithToStringMixedReturn;
+
+// @see https://3v4l.org/IrE2q#v7.4.33
+class WithParentMixedReturn extends ParentClassWithToStringMixedReturn
+{
+    public function __toString(): string
+    {
+        return 'value';
+    }
+}
+
+?>