diff --git a/xo-install.sh b/xo-install.sh
index 6e7b060..0c0f5e4 100755
--- a/xo-install.sh
+++ b/xo-install.sh
@@ -27,6 +27,7 @@ PRESERVE=${PRESERVE:-"3"}
 XOUSER=${XOUSER:-"root"}
 CONFIGPATH="$(getent passwd $XOUSER | cut -d: -f6)"
 PLUGINS="${PLUGINS:-"none"}"
+ADDITIONAL_PLUGINS="${ADDITIONAL_PLUGINS:-"none"}"
 REPOSITORY="${REPOSITORY:-"https://github.com/vatesfr/xen-orchestra"}"
 OS_CHECK="${OS_CHECK:-"true"}"
 ARCH_CHECK="${ARCH_CHECK:-"true"}"