diff --git a/esp8266/modesp.c b/esp8266/modesp.c
index 6b4f16310f..94129812bf 100644
--- a/esp8266/modesp.c
+++ b/esp8266/modesp.c
@@ -582,7 +582,7 @@ STATIC mp_obj_t esp_flash_read(mp_obj_t offset_in, mp_obj_t len_in) {
     m_del(byte, buf, len);
     nlr_raise(mp_obj_new_exception_arg1(&mp_type_OSError, MP_OBJ_NEW_SMALL_INT(res == SPI_FLASH_RESULT_TIMEOUT ? ETIMEDOUT : EIO)));
 }
-STATIC MP_DEFINE_CONST_FUN_OBJ_3(esp_flash_read_obj, esp_flash_read);
+STATIC MP_DEFINE_CONST_FUN_OBJ_2(esp_flash_read_obj, esp_flash_read);
 
 STATIC const mp_map_elem_t esp_module_globals_table[] = {
     { MP_OBJ_NEW_QSTR(MP_QSTR___name__), MP_OBJ_NEW_QSTR(MP_QSTR_esp) },