diff --git a/Dockerfile b/Dockerfile
index 5c7632b..c838034 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -15,7 +15,7 @@ ADD build/*.conf /etc/supervisor/conf.d/
 ADD build/root/*.sh /root/
 
 # get release tag name from build arg
-ARG release_tag_name
+arg RELEASETAG
 
 # add run bash scripts
 ADD run/nobody/*.sh /home/nobody/