diff --git a/items/zfs_pool.py b/items/zfs_pool.py
index bbc6707..e0d8a31 100644
--- a/items/zfs_pool.py
+++ b/items/zfs_pool.py
@@ -61,8 +61,8 @@ def prepare_blockdevice(node, device):
         # We create a new partition on a raw disk. That partition will
         # be used for ZFS. Yes, this is on purpose. No, creating a pool
         # on raw disks does not work properly on Linux.
-        node.run("parted {} mklabel gpt".format(quote(device)))
-        node.run("parted {} mkpart -a optimal primary 0% 100%".format(quote(device)))
+        node.run("parted -s {} mklabel gpt".format(quote(device)))
+        node.run("parted -s {} mkpart -a optimal primary 0% 100%".format(quote(device)))
         node.run("partprobe")
 
         # Simply append a "1" to get to the first partition.