diff --git a/de/heat-templates/scripts/instance_boot.sh b/de/heat-templates/scripts/instance_boot.sh
index 0f52ad7..c12b421 100644
--- a/de/heat-templates/scripts/instance_boot.sh
+++ b/de/heat-templates/scripts/instance_boot.sh
@@ -400,6 +400,9 @@
         download_bundles
         workaround_default_forward_policy
         ;;
+    os_only)
+        echo "OS is installed"
+        ;;
     *)
         echo "Usage: $0 {ucp|master|worker}"
         exit 1