diff --git a/nixos/modules/services/finance/libeufin/common.nix b/nixos/modules/services/finance/libeufin/common.nix
index 4e0a6bffe02f..20b99ce9c396 100644
--- a/nixos/modules/services/finance/libeufin/common.nix
+++ b/nixos/modules/services/finance/libeufin/common.nix
@@ -96,7 +96,9 @@ libeufinComponent:
             };
           in
           {
-            path = [ config.services.postgresql.package ];
+            path = [
+              (if cfg.createLocalDatabase then config.services.postgresql.package else pkgs.postgresql)
+            ];
             serviceConfig = {
               Type = "oneshot";
               DynamicUser = true;
diff --git a/nixos/modules/services/mail/roundcube.nix b/nixos/modules/services/mail/roundcube.nix
index 7cb723e3172c..c31c4b069928 100644
--- a/nixos/modules/services/mail/roundcube.nix
+++ b/nixos/modules/services/mail/roundcube.nix
@@ -272,7 +272,7 @@ in
     ];
 
     systemd.services.roundcube-setup = lib.mkMerge [
-      (lib.mkIf (cfg.database.host == "localhost") {
+      (lib.mkIf localDB {
         requires = [ "postgresql.service" ];
         after = [ "postgresql.service" ];
       })
@@ -281,7 +281,9 @@ in
         after = [ "network-online.target" ];
         wantedBy = [ "multi-user.target" ];
 
-        path = [ config.services.postgresql.package ];
+        path = [
+          (if localDB then config.services.postgresql.package else pkgs.postgresql)
+        ];
         script =
           let
             psql = "${lib.optionalString (!localDB) "PGPASSFILE=${cfg.database.passwordFile}"} psql ${
diff --git a/nixos/modules/services/web-apps/immich.nix b/nixos/modules/services/web-apps/immich.nix
index a647b552678f..28e89709afde 100644
--- a/nixos/modules/services/web-apps/immich.nix
+++ b/nixos/modules/services/web-apps/immich.nix
@@ -46,6 +46,9 @@ let
     mkOption
     mkEnableOption
     ;
+
+  postgresqlPackage =
+    if cfg.database.enable then config.services.postgresql.package else pkgs.postgresql;
 in
 {
   options.services.immich = {
@@ -265,7 +268,7 @@ in
       in
       [
         ''
-          ${lib.getExe' config.services.postgresql.package "psql"} -d "${cfg.database.name}" -f "${sqlFile}"
+          ${lib.getExe' postgresqlPackage "psql"} -d "${cfg.database.name}" -f "${sqlFile}"
         ''
       ];
 
@@ -333,7 +336,7 @@ in
       path = [
         # gzip and pg_dumpall are used by the backup service
         pkgs.gzip
-        config.services.postgresql.package
+        postgresqlPackage
       ];
 
       serviceConfig = commonServiceConfig // {