diff --git a/templates/stunnel-client.conf.j2 b/templates/stunnel-client.conf.j2
index faebdd5..479a45e 100644
--- a/templates/stunnel-client.conf.j2
+++ b/templates/stunnel-client.conf.j2
@@ -5,7 +5,7 @@ sslVersionMin = TLSv1.2
 [scraper {{ i }} nodeexporter]
 client      = no
 requireCert = yes
-accept      = {{ prometheus_agent.scrapers[i].nodeexporter }}
+accept      = :::{{ prometheus_agent.scrapers[i].nodeexporter }}
 connect     = {{ prometheus_agent.agents.nodeexporter.args['web.listen-address']|replace('[', '')|replace(']', '') }}
 cert        = /etc/ssl/prometheus_agent.crt
 key         = /etc/ssl/private/prometheus_agent.key
@@ -18,7 +18,7 @@ CAfile      = /etc/ssl/scraper_{{ i }}.crt
 [scraper {{ i }} blackbox]
 client      = no
 requireCert = yes
-accept      = {{ prometheus_agent.scrapers[i].blackbox }}
+accept      = :::{{ prometheus_agent.scrapers[i].blackbox }}
 connect     = {{ prometheus_agent.agents.blackbox.args['web.listen-address']|replace('[', '')|replace(']', '') }}
 cert        = /etc/ssl/prometheus_agent.crt
 key         = /etc/ssl/private/prometheus_agent.key
@@ -33,7 +33,7 @@ CAfile      = /etc/ssl/scraper_{{ i }}.crt
 [scraper {{ i }} proxy {{ j }}]
 client      = no
 requireCert = yes
-accept      = {{ prometheus_agent.scrapers[i].proxy[j] }}
+accept      = :::{{ prometheus_agent.scrapers[i].proxy[j] }}
 connect     = {{ prometheus_agent.agents.proxy.mappings[j].address|replace('[', '')|replace(']', '') }}
 cert        = /etc/ssl/prometheus_agent.crt
 key         = /etc/ssl/private/prometheus_agent.key