diff --git a/ext/standard/var.c b/ext/standard/var.c
index e98cb99cf582..9c8cadb3208c 100644
--- a/ext/standard/var.c
+++ b/ext/standard/var.c
@@ -764,28 +764,13 @@ static inline bool php_var_serialize_class_name(smart_str *buf, zval *struc) /*
 
 static HashTable* php_var_serialize_call_sleep(zend_object *obj, zend_function *fn) /* {{{ */
 {
-	zend_result res;
-	zend_fcall_info fci;
-	zend_fcall_info_cache fci_cache;
 	zval retval;
 
-	fci.size = sizeof(fci);
-	fci.object = obj;
-	fci.retval = &retval;
-	fci.param_count = 0;
-	fci.params = NULL;
-	fci.named_params = NULL;
-	ZVAL_UNDEF(&fci.function_name);
-
-	fci_cache.function_handler = fn;
-	fci_cache.object = obj;
-	fci_cache.called_scope = obj->ce;
-
 	BG(serialize_lock)++;
-	res = zend_call_function(&fci, &fci_cache);
+	zend_call_known_instance_method(fn, obj, &retval, /* param_count */ 0, /* params */ NULL);
 	BG(serialize_lock)--;
 
-	if (res == FAILURE || Z_ISUNDEF(retval)) {
+	if (Z_ISUNDEF(retval) || EG(exception)) {
 		zval_ptr_dtor(&retval);
 		return NULL;
 	}