diff --git a/device/peripheral/flash/fl256s/spi_flash_fl256s.c b/device/peripheral/flash/fl256s/spi_flash_fl256s.c
index 8b82343c3..75097987e 100644
--- a/device/peripheral/flash/fl256s/spi_flash_fl256s.c
+++ b/device/peripheral/flash/fl256s/spi_flash_fl256s.c
@@ -320,7 +320,7 @@ int32_t fl256s_erase(FL256S_DEF_PTR dev, uint32_t address, uint32_t size)
 	DEV_SPI_TRANSFER cmd_xfer;
 
 	// start address of last sector
-	last_address = (address + size) & (~(dev->sector_sz - 1));
+	last_address = (address + size - 1) & (~(dev->sector_sz - 1));
 
 	// start address of first sector
 	address &= ~(dev->sector_sz - 1);
diff --git a/device/peripheral/flash/w25qxx/spi_flash_w25qxx.c b/device/peripheral/flash/w25qxx/spi_flash_w25qxx.c
index 84aaae4f1..4bd7fec45 100644
--- a/device/peripheral/flash/w25qxx/spi_flash_w25qxx.c
+++ b/device/peripheral/flash/w25qxx/spi_flash_w25qxx.c
@@ -264,7 +264,7 @@ int32_t w25qxx_erase(W25QXX_DEF_PTR dev, uint32_t address, uint32_t size)
 	DEV_SPI_TRANSFER cmd_xfer;
 
 	// start address of last sector
-	last_address = (address + size) & (~(dev->sector_sz - 1));
+	last_address = (address + size - 1) & (~(dev->sector_sz - 1));
 
 	// start address of first sector
 	address &= ~(dev->sector_sz - 1);
diff --git a/example/baremetal/dma_spiflash/spi_flash.c b/example/baremetal/dma_spiflash/spi_flash.c
index 131018572..ce889ab8d 100644
--- a/example/baremetal/dma_spiflash/spi_flash.c
+++ b/example/baremetal/dma_spiflash/spi_flash.c
@@ -442,7 +442,7 @@ int32_t spiflash_erase(uint32_t address, uint32_t size)
 	SPI_XFER cmd_xfer;
 
 	// start address of last sector
-	last_address = (address + size) & (~(FLASH_SECTOR_SIZE - 1));
+	last_address = (address + size - 1) & (~(FLASH_SECTOR_SIZE - 1));
 
 	// start address of first sector
 	address &= ~(FLASH_SECTOR_SIZE - 1);