- ION_CHECK(ion_writer_add_annotation(ser->writer, ion_string_from_cstr(&is, ZEND_STRL("p"))));
- ION_CHECK(ion_writer_add_annotation(ser->writer, ion_string_from_cstr(&is, class_name, prop_name - class_name - 1)));
+ ION_CHECK(ion_writer_add_annotation(ser->writer, ion_string_assign_cstr(&is, ZEND_STRL("p"))));
+ ION_CHECK(ion_writer_add_annotation(ser->writer, ion_string_assign_cstr(&is, (char *) class_name, prop_name - class_name - 1)));