diff --git a/pillar/cluster/denc/web-proxy.sls b/pillar/cluster/denc/web-proxy.sls
index fcb2c93..ca0389a 100644
--- a/pillar/cluster/denc/web-proxy.sls
+++ b/pillar/cluster/denc/web-proxy.sls
@@ -221,7 +221,7 @@ nginx:
             - server_name: ci.lysergic.dev ci.git.com.de
             - location /:
               - proxy_pass: https://ci.lysergic.dev
-              - proxy_ssl_verify: on
+              - proxy_ssl_verify: 'on'
 
 manage_firewall: True
 firewalld: