diff --git a/nixos/tests/installer.nix b/nixos/tests/installer.nix
index bd1bf7331531..df89949074f9 100644
--- a/nixos/tests/installer.nix
+++ b/nixos/tests/installer.nix
@@ -633,10 +633,10 @@ in {
           + " mklabel msdos"
           + " mkpart primary ext2 1M 100MB"  # /boot
           + " mkpart extended 100M -1s"
-          + " mkpart logical 102M 2102M"  # md0 (root), first device
-          + " mkpart logical 2103M 4103M"  # md0 (root), second device
-          + " mkpart logical 4104M 4360M"  # md1 (swap), first device
-          + " mkpart logical 4361M 4617M",  # md1 (swap), second device
+          + " mkpart logical 102M 3102M"  # md0 (root), first device
+          + " mkpart logical 3103M 6103M"  # md0 (root), second device
+          + " mkpart logical 6104M 6360M"  # md1 (swap), first device
+          + " mkpart logical 6361M 6617M",  # md1 (swap), second device
           "udevadm settle",
           "ls -l /dev/vda* >&2",
           "cat /proc/partitions >&2",