diff --git a/docker/prometheus/confd/templates/supervisord.tmpl b/docker/prometheus/confd/templates/supervisord.tmpl
index e7bce46..2e76111 100644
--- a/docker/prometheus/confd/templates/supervisord.tmpl
+++ b/docker/prometheus/confd/templates/supervisord.tmpl
@@ -11,7 +11,7 @@ stderr_logfile=/var/log/confd.err.log
 stdout_logfile=/var/log/confd.out.log
 
 [program:prometheus]
-command=/usr/local/bin/prometheus --config.file=/etc/prometheus/prometheus.yml --storage.tsdb.retention.time={{ getv "/time/storage_interval"}}{{ getv "/time/storage_interval_unit")}}
+command=/usr/local/bin/prometheus --config.file=/etc/prometheus/prometheus.yml --storage.tsdb.retention.time={{ getv "/time/storage_interval"}}{{ getv "/time/storage_interval_unit"}}
 autostart=true
 autorestart=true
 stderr_logfile=/var/log/prometheus.err.log