diff --git a/os/build.py b/os/build.py
index c84070d..6ba41fd 100755
--- a/os/build.py
+++ b/os/build.py
@@ -129,6 +129,7 @@ def main():
             # We need ca-certificates for fetching https packages repos.
             "--debootstrap-options", "--exclude=isc-dhcp-client,isc-dhcp-common,ifupdown --include=ca-certificates" +
                 VARIANT_EXTRA_BOOTSTRAP.get(args.variant, ""),
+            "--chroot-squashfs-compression-type", "zstd",
             "--loadlin", "false",
             "--iso-volume", f"SOI {VARIANT_LABEL[args.variant]} @ISOVOLUME_TS@",
             "--bootappend-live", "boot=live toram=filesystem.squashfs",