diff --git a/mkimage.sh.in b/mkimage.sh.in
index 858bdd5..aa48271 100644
--- a/mkimage.sh.in
+++ b/mkimage.sh.in
@@ -155,7 +155,7 @@ _EOF
     sfdisk ${FILENAME} <<_EOF
 label: dos
 2048,${BOOT_FSSIZE},b,*
-${BOOT_FSSIZE},+,L
+,+,L
 _EOF
     LOOPDEV=$(losetup --show --find --partscan $FILENAME)
     mkfs.${BOOT_FSTYPE} $_args ${LOOPDEV}p1 >/dev/null