diff --git a/templates/prometheus.service.j2 b/templates/prometheus.service.j2
index 5686ad17..fc8f659b 100644
--- a/templates/prometheus.service.j2
+++ b/templates/prometheus.service.j2
@@ -13,8 +13,8 @@ ExecStart={{ prometheus_root_dir }}/prometheus \
   -storage.local.path={{ prometheus_db_dir }} \
   -web.listen-address={{ prometheus_web_listen_address }} \
   -web.external-url={{ prometheus_web_external_url }}{% if prometheus_alertmanager_url != "" %}\
-  -alertmanager.url={{ prometheus_alertmanager_url }}{% endif %}
-{#  {% for flag, flag_value in prometheus_config_flags_extra.iteritems() %}-{{ flag }}={{ flag_value }} {% endfor %} #}
+  -alertmanager.url={{ prometheus_alertmanager_url }}{% endif %}{% for flag, flag_value in prometheus_config_flags_extra.iteritems() %}\
+  -{{ flag }}={{ flag_value }} {% endfor %}
 
 SyslogIdentifier=prometheus
 Restart=always