diff --git a/config/services/postfixadmin.nix b/config/services/postfixadmin.nix
index 9234e072..02286287 100644
--- a/config/services/postfixadmin.nix
+++ b/config/services/postfixadmin.nix
@@ -33,4 +33,5 @@
     sslCertificate = "/var/lib/acme/chir.rs/cert.pem";
     sslCertificateKey = "/var/lib/acme/chir.rs/key.pem";
   };
+  services.phpfpm.pools.postfixadmin.group = "acme"; # there is no nginx group
 }