diff --git a/gentoo-gnome.sh b/gentoo-gnome.sh
index 47c8f93..5fe618c 100644
--- a/gentoo-gnome.sh
+++ b/gentoo-gnome.sh
@@ -463,7 +463,7 @@ btrfs-tweaks() {
 }
 
 initialize-disk() {
-	SWAP_SIZE="$(expr $ROOT_PARTITION_SIZE + 16)GiB"
+	export SWAP_SIZE="$(expr $ROOT_PARTITION_SIZE + 16)GiB"
 	parted /dev/$HARD_DISK mklabel gpt
 	parted -a optimal /dev/$HARD_DISK mkpart primary fat32 1MiB 200MiB
 	parted -a optimal /dev/$HARD_DISK mkpart primary ext3 200MiB $ROOT_PARTITION_SIZE