diff --git a/stm-firmware/updater/ram-code/flash-writer.c b/stm-firmware/updater/ram-code/flash-writer.c
index c5782ba..1496cf6 100644
--- a/stm-firmware/updater/ram-code/flash-writer.c
+++ b/stm-firmware/updater/ram-code/flash-writer.c
@@ -26,7 +26,7 @@ void flash_writer_perform_mass_erase(void)
 	flash_writer_enable_access();
 	while (flash_op_busy());
 
-	FLASH->CR = DMA_SxCR_PSIZE_1;
+	FLASH->CR = FLASH_CR_PSIZE_1;
 	FLASH->CR |= FLASH_CR_MER;
 	FLASH->CR |= FLASH_CR_STRT;