diff --git a/configuration.nix b/configuration.nix
index 2aa8b3b..cb7790c 100644
--- a/configuration.nix
+++ b/configuration.nix
@@ -158,6 +158,7 @@ in
     defaults.email = "yisroel.d.baum@gmail.com";
     certs = {
       "${domainName}" = {
+        domain = "*.${domainName}";
         webroot = "/var/lib/acme/.challenges";
         group = config.services.nginx.group;
         extraDomainNames = [