diff --git a/Zend/tests/attributes/deprecated/functions/gh17866.phpt b/Zend/tests/attributes/deprecated/functions/gh17866.phpt
new file mode 100644
index 0000000000000..d1e9171cc832e
--- /dev/null
+++ b/Zend/tests/attributes/deprecated/functions/gh17866.phpt
@@ -0,0 +1,33 @@
+--TEST--
+GH-17866 (zend_mm_heap corrupted error after upgrading from 8.4.3 to 8.4.4)
+--FILE--
+<?php
+
+class Foo {
+    #[Deprecated("xyzzy")]
+    public function __invoke() {
+        echo "In __invoke\n";
+    }
+}
+
+$foo = new Foo;
+$closure = Closure::fromCallable($foo);
+$test = $closure->__invoke(...);
+
+$rc = new ReflectionMethod($test, '__invoke');
+var_dump($rc->getAttributes());
+
+$test();
+
+?>
+--EXPECTF--
+array(1) {
+  [0]=>
+  object(ReflectionAttribute)#%d (1) {
+    ["name"]=>
+    string(10) "Deprecated"
+  }
+}
+
+Deprecated: Method Foo::__invoke() is deprecated, xyzzy in %s on line %d
+In __invoke
diff --git a/Zend/zend_closures.c b/Zend/zend_closures.c
index 629aa7d51a840..c3a06ad7360f2 100644
--- a/Zend/zend_closures.c
+++ b/Zend/zend_closures.c
@@ -467,6 +467,11 @@ ZEND_API zend_function *zend_get_closure_invoke_method(zend_object *object) /* {
 		ZEND_ACC_RETURN_REFERENCE | ZEND_ACC_VARIADIC | ZEND_ACC_HAS_RETURN_TYPE;
 
 	invoke->common = closure->func.common;
+
+	if (invoke->common.attributes) {
+		GC_TRY_ADDREF(invoke->common.attributes);
+	}
+
 	/* We return ZEND_INTERNAL_FUNCTION, but arg_info representation is the
 	 * same as for ZEND_USER_FUNCTION (uses zend_string* instead of char*).
 	 * This is not a problem, because ZEND_ACC_HAS_TYPE_HINTS is never set,