typo

diff --git a/Zend/zend_builtin_functions.c b/Zend/zend_builtin_functions.c
index 714313e1ed71ef8b0f2ebe6a591818c81367aaaf..d5f764c5c099e9fe8a76c4c6622c93f8ef1663a8 100644 (file)
--- a/Zend/zend_builtin_functions.c
+++ b/Zend/zend_builtin_functions.c
@@ -689,7 +689,7 @@ static void is_a_impl(INTERNAL_FUNCTION_PARAMETERS, zend_bool only_subclass) /*
 
        convert_to_text_ex(class_name);
 
-       if (zend_u_lookup_class_ex(Z_TYPE_PP(class_name), Z_UNIVAL_PP(class_name), Z_UNILEN_PP(class_name), ZSTR_NULL, 1, &ce TSRMLS_CC) == FAILURE) {
+       if (zend_u_lookup_class_ex(Z_TYPE_PP(class_name), Z_UNIVAL_PP(class_name), Z_UNILEN_PP(class_name), NULL_ZSTR, 1, &ce TSRMLS_CC) == FAILURE) {
                retval = 0;
        } else {
                if (only_subclass) {