diff --git a/nixos/modules/services/web-apps/freshrss.nix b/nixos/modules/services/web-apps/freshrss.nix
index 7a22e1523192..20b1e5605596 100644
--- a/nixos/modules/services/web-apps/freshrss.nix
+++ b/nixos/modules/services/web-apps/freshrss.nix
@@ -281,7 +281,10 @@ in
               ${if cfg.database.passFile != null then "--db-password" else null} = ''"$(cat ${cfg.database.passFile})"'';
               ${if cfg.database.user != null then "--db-user" else null} = ''"${cfg.database.user}"'';
               ${if cfg.database.tableprefix != null then "--db-prefix" else null} = ''"${cfg.database.tableprefix}"'';
+              # hostname:port e.g. "localhost:5432"
               ${if cfg.database.host != null && cfg.database.port != null then "--db-host" else null} = ''"${cfg.database.host}:${toString cfg.database.port}"'';
+              # socket path e.g. "/run/postgresql"
+              ${if cfg.database.host != null && cfg.database.port == null then "--db-host" else null} = ''"${cfg.database.host}"'';
             });
         in
         {