diff --git a/lib.nix b/lib.nix
index 488ce36..5ce67c2 100644
--- a/lib.nix
+++ b/lib.nix
@@ -28,9 +28,8 @@ let
   getHostIps = hostname:
     filter (o: o != null) [ (getHostIpv4 hostname) (getHostIpv6 hostname) ];
 
-  getDomainPostgresqlServer = hostname:
-    let domain-name = entities.hosts."${hostname}".domain;
-    in getHostFqdn entities.domains."${domain-name}".postgresql-server;
+  getDomainPostgresqlServer = domain:
+    getHostFqdn entities.domains."${domain}".postgresql-server;
 
 in {
   inherit getHostSite getHostDomain getHostRealm getHostFqdn getHostIpv4