diff --git a/deployment/bare_metal/start.sh b/deployment/bare_metal/start.sh
index 1d0f982c2..6c3c07766 100755
--- a/deployment/bare_metal/start.sh
+++ b/deployment/bare_metal/start.sh
@@ -105,7 +105,7 @@ case "$NGINX_SSL" in
     *) TEMPLATE_FILE="gradido.conf.template" ;;
 esac
 envsubst '$FEDERATION_NGINX_CONF' < $NGINX_CONFIG_DIR/$TEMPLATE_FILE > $NGINX_CONFIG_DIR/gradido.conf.tmp
-export FEDERATION_NGINX_CONF=
+unset FEDERATION_NGINX_CONF
 envsubst "$(env | sed -e 's/=.*//' -e 's/^/\$/g')" < $NGINX_CONFIG_DIR/gradido.conf.tmp > $NGINX_CONFIG_DIR/gradido.conf
 rm $NGINX_CONFIG_DIR/gradido.conf.tmp
 rm $NGINX_CONFIG_DIR/gradido-federation.conf.locations