diff --git a/classes/sdcard_image-sunxi.bbclass b/classes/sdcard_image-sunxi.bbclass
index a168f2c..53ced0b 100644
--- a/classes/sdcard_image-sunxi.bbclass
+++ b/classes/sdcard_image-sunxi.bbclass
@@ -66,7 +66,8 @@ IMAGE_CMD_sunxi-sdimg () {
 
 	# Create a vfat image with boot files
 	BOOT_BLOCKS=$(LC_ALL=C parted -s ${SDIMG} unit b print | awk '/ 1 / { print substr($4, 1, length($4 -1)) / 512 /2 }')
-	mkfs.vfat -n "${BOOTDD_VOLUME_ID}" -S 512 -C ${WORKDIR}/boot.img $BOOT_BLOCKS
+	rm -f ${WORKDIR}/boot.img
+    mkfs.vfat -n "${BOOTDD_VOLUME_ID}" -S 512 -C ${WORKDIR}/boot.img $BOOT_BLOCKS
 
 	mcopy -i ${WORKDIR}/boot.img -s ${DEPLOY_DIR_IMAGE}/${KERNEL_IMAGETYPE}-${MACHINE}.bin ::uImage