diff --git a/Zend/tests/property_hooks/gh20270.phpt b/Zend/tests/property_hooks/gh20270.phpt
new file mode 100644
index 0000000000000..0a7415ce230a5
--- /dev/null
+++ b/Zend/tests/property_hooks/gh20270.phpt
@@ -0,0 +1,49 @@
+--TEST--
+GH-20270: Parent hook call with named arguments
+--FILE--
+<?php
+
+class A {
+    public mixed $prop1;
+    public mixed $prop2 {
+        set(mixed $custom) => $custom;
+    }
+}
+
+class B extends A {
+    public mixed $prop1 {
+        set {
+            parent::$prop1::set(value: 42);
+            parent::$prop1::set(unknown: 43);
+        }
+    }
+    public mixed $prop2 {
+        set {
+            parent::$prop2::set(custom: 42);
+            parent::$prop2::set(value: 43);
+        }
+    }
+}
+
+$b = new B();
+
+try {
+    $b->prop1 = 0;
+} catch (Error $e) {
+    echo $e->getMessage(), "\n";
+}
+var_dump($b->prop1);
+
+try {
+    $b->prop2 = 0;
+} catch (Error $e) {
+    echo $e->getMessage(), "\n";
+}
+var_dump($b->prop2);
+
+?>
+--EXPECT--
+Unknown named parameter $unknown
+int(42)
+Unknown named parameter $value
+int(42)
diff --git a/Zend/zend_object_handlers.c b/Zend/zend_object_handlers.c
index 67e8664f5a7ac..c113f65a7a894 100644
--- a/Zend/zend_object_handlers.c
+++ b/Zend/zend_object_handlers.c
@@ -1783,7 +1783,9 @@ ZEND_API zend_function *zend_get_property_hook_trampoline(
 	const zend_property_info *prop_info,
 	zend_property_hook_kind kind, zend_string *prop_name)
 {
-	static const zend_arg_info arg_info[1] = {{0}};
+	static const zend_internal_arg_info arg_info[2] = {
+		{ .name = "value" }
+	};
 	zend_function *func;
 	if (EXPECTED(EG(trampoline).common.function_name == NULL)) {
 		func = &EG(trampoline);