diff --git a/subdomain-proxy.conf b/subdomain-proxy.conf
index d9842f8..ba27098 100644
--- a/subdomain-proxy.conf
+++ b/subdomain-proxy.conf
@@ -46,7 +46,7 @@ server {
 
       # Set the security headers
 
-      add-header Permissions-Policy "interest-cohort=()"; # Don't allow Google FLoC
+      add_header Permissions-Policy "interest-cohort=()"; # Don't allow Google FLoC
       add_header Strict-Transport-Security "max-age=31536000; includeSubDomains; preload"; #HSTS
       add_header X-Frame-Options DENY; #Prevents clickjacking
       add_header X-Content-Type-Options nosniff; #Prevents mime sniffing