diff --git a/modules/webstack.nix b/modules/webstack.nix
index a2c645a..7c53352 100644
--- a/modules/webstack.nix
+++ b/modules/webstack.nix
@@ -95,12 +95,12 @@
     email = "akasroua@gmail.com";
     certs = {
       "coolneng.duckdns.org" = {
-        extraDomains = {
-          "radicale.coolneng.duckdns.org" = null;
-          "sync.coolneng.duckdns.org" = null;
-          "git.coolneng.duckdns.org" = null;
-          "rss.coolneng.duckdns.org" = null;
-        };
+        extraDomainNames = [
+          "radicale.coolneng.duckdns.org"
+          "sync.coolneng.duckdns.org"
+          "git.coolneng.duckdns.org"
+          "rss.coolneng.duckdns.org"
+        ];
       };
     };
   };