diff --git a/ct/debian.sh b/ct/debian.sh
index 198a0bf01..e5bdd8a3c 100644
--- a/ct/debian.sh
+++ b/ct/debian.sh
@@ -13,6 +13,7 @@ var_disk="${var_disk:-20}"
 var_os="${var_os:-debian}"
 var_version="${var_version:-13}"
 var_unprivileged="${var_unprivileged:-1}"
+var_gpu="${var_gpu:-yes}"
 #var_fuse="${var_fuse:-no}"
 #var_tun="${var_tun:-no}"