diff --git a/components/esp_rom/include/esp32s2beta/rom/spi_flash.h b/components/esp_rom/include/esp32s2beta/rom/spi_flash.h
index 130e1cac7c..a94772b6ea 100644
--- a/components/esp_rom/include/esp32s2beta/rom/spi_flash.h
+++ b/components/esp_rom/include/esp32s2beta/rom/spi_flash.h
@@ -105,8 +105,8 @@ extern "C" {
 //SPI address register
 #define ESP_ROM_SPIFLASH_BYTES_LEN            24
 #define ESP_ROM_SPIFLASH_BUFF_BYTE_WRITE_NUM  32
-#define ESP_ROM_SPIFLASH_BUFF_BYTE_READ_NUM   64
-#define ESP_ROM_SPIFLASH_BUFF_BYTE_READ_BITS  0x3f
+#define ESP_ROM_SPIFLASH_BUFF_BYTE_READ_NUM   16
+#define ESP_ROM_SPIFLASH_BUFF_BYTE_READ_BITS  0xf
 
 //SPI status register
 #define  ESP_ROM_SPIFLASH_BUSY_FLAG           BIT0