diff --git a/nixos/tests/installer.nix b/nixos/tests/installer.nix
index c7815bde3f5..af87705b927 100644
--- a/nixos/tests/installer.nix
+++ b/nixos/tests/installer.nix
@@ -327,12 +327,12 @@ in {
           $machine->succeed(
               "parted /dev/vda --"
               . " mklabel msdos"
-              . " mkpart primary ext2 1M 30MB" # /boot
-              . " mkpart extended 30M -1s"
-              . " mkpart logical 31M 1531M" # md0 (root), first device
-              . " mkpart logical 1540M 3040M" # md0 (root), second device
-              . " mkpart logical 3050M 3306M" # md1 (swap), first device
-              . " mkpart logical 3320M 3576M", # md1 (swap), second device
+              . " mkpart primary ext2 1M 100MB" # /boot
+              . " mkpart extended 100M -1s"
+              . " mkpart logical 102M 1602M" # md0 (root), first device
+              . " mkpart logical 1603M 3103M" # md0 (root), second device
+              . " mkpart logical 3104M 3360M" # md1 (swap), first device
+              . " mkpart logical 3361M 3617M", # md1 (swap), second device
               "udevadm settle",
               "ls -l /dev/vda* >&2",
               "cat /proc/partitions >&2",