diff --git a/os/build.py b/os/build.py
index 23e6127..a072ca8 100755
--- a/os/build.py
+++ b/os/build.py
@@ -23,12 +23,12 @@ VARIANT_LABEL = {
 
 VARIANT_BOOT_OPTIONS = {
     "contestant": [
-        dict(label="SOI contest", cmdline="boot=live toram"),
+        dict(label="SOI contest", cmdline="boot=live toram=filesystem.squashfs"),
         dict(label="SOI contest, run from drive", cmdline="boot=live"),
         dict(label="SOI contest, fail-safe mode", cmdline="@LB_BOOTAPPEND_LIVE_FAILSAFE@"),
     ],
     "training-live": [
-        dict(label="SOI live system, run from RAM", cmdline="boot=live toram"),
+        dict(label="SOI live system, run from RAM", cmdline="boot=live toram=filesystem.squashfs"),
         dict(label="SOI live system, run from drive", cmdline="boot=live"),
         dict(label="SOI live system, fail-safe mode", cmdline="@LB_BOOTAPPEND_LIVE_FAILSAFE@"),
     ],
@@ -131,7 +131,7 @@ def main():
                 VARIANT_EXTRA_BOOTSTRAP.get(args.variant, ""),
             "--loadlin", "false",
             "--iso-volume", f"SOI {VARIANT_LABEL[args.variant]} @ISOVOLUME_TS@",
-            "--bootappend-live", "boot=live toram",
+            "--bootappend-live", "boot=live toram=filesystem.squashfs",
         ]
         + VARIANT_EXTRA_LB_CONFIG.get(args.variant, [])
     )