diff --git a/rules-tests/Php80/Rector/ClassMethod/AddParamBasedOnParentClassMethodRector/Fixture/implements_interface_flipped.php.inc b/rules-tests/Php80/Rector/ClassMethod/AddParamBasedOnParentClassMethodRector/Fixture/implements_interface_flipped.php.inc
new file mode 100644
index 00000000000..d1f918415bd
--- /dev/null
+++ b/rules-tests/Php80/Rector/ClassMethod/AddParamBasedOnParentClassMethodRector/Fixture/implements_interface_flipped.php.inc
@@ -0,0 +1,41 @@
+<?php
+
+namespace Rector\Tests\Php80\Rector\ClassMethod\AddParamBasedOnParentClassMethodRector\Fixture;
+
+class ImplementsInterfaceFlipped implements InterfaceWithParamFlipped {
+    public function execute()
+    {
+    }
+}
+
+/**
+ * Both interface and class on same file on purpose to ensure locate
+ * parent interface bug
+ */
+interface InterfaceWithParamFlipped
+{
+    public function execute($foo);
+}
+
+?>
+-----
+<?php
+
+namespace Rector\Tests\Php80\Rector\ClassMethod\AddParamBasedOnParentClassMethodRector\Fixture;
+
+class ImplementsInterfaceFlipped implements InterfaceWithParamFlipped {
+    public function execute($foo)
+    {
+    }
+}
+
+/**
+ * Both interface and class on same file on purpose to ensure locate
+ * parent interface bug
+ */
+interface InterfaceWithParamFlipped
+{
+    public function execute($foo);
+}
+
+?>