diff --git a/demo/supervisord.conf b/demo/supervisord.conf
index a8b4ff505..19ab03dc0 100644
--- a/demo/supervisord.conf
+++ b/demo/supervisord.conf
@@ -7,7 +7,7 @@ logfile_backups=0
 loglevel = info
 
 [program:alertmanager1]
-command=/alertmanager --config.file=/etc/alertmanager.yaml --storage.path=/tmp/alertmanager1 --web.listen-address=:9093  --cluster.listen-address=127.0.0.1:8001 --cluster.peer=127.0.0.1:8002 --cluster.settle-timeout=1s
+command=/alertmanager --config.file=/etc/alertmanager.yaml --log.level=error --storage.path=/tmp/alertmanager1 --web.listen-address=:9093  --cluster.listen-address=127.0.0.1:8001 --cluster.peer=127.0.0.1:8002 --cluster.settle-timeout=1s
 autorestart=true
 stdout_logfile=/dev/stdout
 stdout_logfile_maxbytes=0
@@ -15,7 +15,7 @@ stderr_logfile=/dev/stderr
 stderr_logfile_maxbytes=0
 
 [program:alertmanager2]
-command=/alertmanager --config.file=/etc/alertmanager.yaml --storage.path=/tmp/alertmanager1 --web.listen-address=:9094  --cluster.listen-address=127.0.0.1:8002 --cluster.peer=127.0.0.1:8001 --cluster.settle-timeout=1s
+command=/alertmanager --config.file=/etc/alertmanager.yaml --log.level=error --storage.path=/tmp/alertmanager1 --web.listen-address=:9094  --cluster.listen-address=127.0.0.1:8002 --cluster.peer=127.0.0.1:8001 --cluster.settle-timeout=1s
 autorestart=true
 stdout_logfile=/dev/stdout
 stdout_logfile_maxbytes=0
@@ -23,7 +23,7 @@ stderr_logfile=/dev/stderr
 stderr_logfile_maxbytes=0
 
 [program:alertmanager3]
-command=/alertmanager --config.file=/etc/alertmanager.yaml --storage.path=/tmp/alertmanager3 --web.listen-address=:9095 --cluster.listen-address=127.0.0.1:8003
+command=/alertmanager --config.file=/etc/alertmanager.yaml --log.level=error --storage.path=/tmp/alertmanager3 --web.listen-address=:9095 --cluster.listen-address=127.0.0.1:8003
 autorestart=true
 stdout_logfile=/dev/stdout
 stdout_logfile_maxbytes=0