diff --git a/main.sh b/main.sh
index f048e73..9cabf25 100644
--- a/main.sh
+++ b/main.sh
@@ -90,7 +90,7 @@ do_partition() {
 		parted -a optimal $TARGET_PHY_WWN -s -- mklabel gpt
 		size=500
 		parted -a optimal $TARGET_PHY_WWN unit mib -s -- mkpart EFI fat32 $start $(( start + size ))
-		start=$(( start + size + 1 ))
+		start=$(( start + size ))
 		parted -a optimal $TARGET_PHY_WWN unit mib -s -- mkpart root $start -1s
 		mkfs.vfat -F32 $TARGET_PHY_WWN-part1
 		TARGET_PART="2"
@@ -101,7 +101,7 @@ do_partition() {
 		if [ "$ENCRYPTION_STYLE" == "b" ] || [ "$ENCRYPTION_STYLE" == "e" ]; then
 			size=2048
 			parted -a optimal $TARGET_PHY_WWN unit mib -s -- mkpart primary ext4 $start $(( start + size ))
-			start=$(( start + size + 1 ))
+			start=$(( start + size ))
 			mkfs.btrfs $TARGET_PHY_WWN-part1
 			TARGET_PART="2"
 		fi