diff --git a/mail-server.nix b/mail-server.nix
index f207cbe..c5267dd 100644
--- a/mail-server.nix
+++ b/mail-server.nix
@@ -209,7 +209,7 @@ in {
         uid = 10574;
         group = "mail-server-solr";
       };
-      group.mail-server-solr.members = [ "mail-server-solr" ];
+      groups.mail-server-solr.members = [ "mail-server-solr" ];
     };
 
     fudo.secrets.host-secrets."${hostname}" = {