diff --git a/templates/nginx-virthost.j2 b/templates/nginx-virthost.j2
index d3e37dd..d171b6c 100644
--- a/templates/nginx-virthost.j2
+++ b/templates/nginx-virthost.j2
@@ -54,7 +54,7 @@ server {
     {% endif %}
     {% if nginx_set_content_security_options %}
     proxy_hide_header Content-Security-Policy;
-    add_header Content-Security-Policy "frame-src{% for s in nginx_content_security_src_acl %} {{ l }}{% endfor %}; frame-ancestors{% for l in nginx_content_security_ancestor_acl %} {{ l }}{% endfor %};";
+    add_header Content-Security-Policy "frame-src{% for s in nginx_content_security_src_acl %} {{ s }}{% endfor %}; frame-ancestors{% for l in nginx_content_security_ancestor_acl %} {{ l }}{% endfor %};";
     {% endif %}
     server_tokens {{ item.server_tokens | default('off') }};