diff --git a/mctp-demux.service b/mctp-demux.service
index c04a46d..ad09b30 100644
--- a/mctp-demux.service
+++ b/mctp-demux.service
@@ -3,6 +3,7 @@
 
 [Service]
 Restart=always
+Environment=DEMUX_BINDING_OPTS=null
 EnvironmentFile=-/etc/default/mctp
 ExecStart=/usr/bin/mctp-demux-daemon $DEMUX_BINDING_OPTS
 SyslogIdentifier=mctp-demux