diff --git a/docker-compose.yml b/docker-compose.yml
index b9b41a7..2a869ec 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -46,7 +46,7 @@ services:
       - bigbluebutton:/var/bigbluebutton
       - ./mod/nginx/bbb:/etc/nginx/bbb
       - ./mod/nginx/bigbluebutton:/etc/nginx/conf.d/default.conf
-      - ${DEFAULT_PRESENTATION}:/etc/nginx/html/default.pdf
+      - ${DEFAULT_PRESENTATION:-/dev/null}:/etc/nginx/html/default.pdf
     networks:
       - bbb-net
     extra_hosts: