diff --git a/Workbench/ad/Dockerfile b/Workbench/ad/Dockerfile
index 2847e6e..b0d51a6 100644
--- a/Workbench/ad/Dockerfile
+++ b/Workbench/ad/Dockerfile
@@ -9,6 +9,7 @@ RUN apt-get install -y attr acl samba smbclient ldap-utils winbind libnss-winbin
 RUN apt-get install -y openvpn inetutils-ping
 
 ADD container_files/certs/ /var/lib/samba/private/tls/
+RUN chmod 600 /var/lib/samba/private/tls/key.pem
 
 ADD container_files/start.sh /start.sh
 RUN chmod 755 /start.sh