diff --git a/resources/rebuild.sh b/resources/rebuild.sh
index be9e90308b3..02db0847f49 100755
--- a/resources/rebuild.sh
+++ b/resources/rebuild.sh
@@ -85,10 +85,9 @@ EOF
     id_rsa=$OUTPUT_DIR/$ROOTFS_NAME.id_rsa
     sudo cp id_rsa $id_rsa
 
-    # -comp zstd but guest kernel does not support
     rootfs_img="$OUTPUT_DIR/$ROOTFS_NAME.squashfs"
     sudo mv $rootfs/root/manifest $OUTPUT_DIR/$ROOTFS_NAME.manifest
-    sudo mksquashfs $rootfs $rootfs_img -all-root -noappend
+    sudo mksquashfs $rootfs $rootfs_img -all-root -noappend -comp zstd
     rootfs_ext4=$OUTPUT_DIR/$ROOTFS_NAME.ext4
     dir2ext4img $rootfs $rootfs_ext4
     sudo rm -rf $rootfs