diff --git a/nixos/modules/installer/tools/nixos-install.sh b/nixos/modules/installer/tools/nixos-install.sh
index 22c1e0fe9a34..defc46ad2a72 100644
--- a/nixos/modules/installer/tools/nixos-install.sh
+++ b/nixos/modules/installer/tools/nixos-install.sh
@@ -13,6 +13,7 @@ extraBuildFlags=()
 
 mountPoint=/mnt
 channelPath=
+system=
 
 while [ "$#" -gt 0 ]; do
     i="$1"; shift 1