diff --git a/docs/install.sh b/docs/install.sh
index 7181f988..1f223d9b 100755
--- a/docs/install.sh
+++ b/docs/install.sh
@@ -77,7 +77,9 @@ if [[ $REPLY =~ ^[Yy]$ ]]; then
   # If there is a keyfile for a data disk, put copy it to the root partition and
   # ensure the permissions are set appropriately.
   if [[ -f "/tmp/swap.key" ]]; then
+    sudo cp /tmp/swap.key /mnt/etc/swap.key
     sudo cp /tmp/swap.key /mnt/tmp/swap.key
+    sudo chmod 0400 /mnt/etc/swap.key
     sudo chmod 0400 /mnt/tmp/swap.key
   fi
 fi
\ No newline at end of file