diff --git a/installers/00-default-install-options.rc b/installers/00-default-install-options.rc
index 59ee549..6159a52 100644
--- a/installers/00-default-install-options.rc
+++ b/installers/00-default-install-options.rc
@@ -33,6 +33,7 @@
 export DOCKER_REGISTRY_PASSWORD=
 export DOCKER_REGISTRY_URL=
 export DOCKER_PROXY_URL=
+export MODULES_FOR_TESTING=
 export MODULE_DOCKER_TAG=
 export OSM_CLIENT_VERSION="master"
 export OSM_IM_VERSION="master"