/* Error structures */
-#define SD_BUS_ERROR_MAKE_CONST(name, message) ((sd_bus_error) {(name), (message), 0})
+#define SD_BUS_ERROR_MAKE_CONST(name, message) ((const sd_bus_error) {(name), (message), 0})
#define SD_BUS_ERROR_NULL SD_BUS_ERROR_MAKE_CONST(NULL, NULL)
void sd_bus_error_free(sd_bus_error *e);