diff --git a/nixos/modules/services/networking/xrdp.nix b/nixos/modules/services/networking/xrdp.nix
index c4f828f3c5a6..e9f123a181ae 100644
--- a/nixos/modules/services/networking/xrdp.nix
+++ b/nixos/modules/services/networking/xrdp.nix
@@ -97,6 +97,11 @@ in
         '';
       };
 
+      confDir = mkOption {
+        type = types.path;
+        default = confDir;
+        description = "The location of the config files for xrdp.";
+      };
     };
   };
 
@@ -149,7 +154,7 @@ in
           User = "xrdp";
           Group = "xrdp";
           PermissionsStartOnly = true;
-          ExecStart = "${cfg.package}/bin/xrdp --nodaemon --port ${toString cfg.port} --config ${confDir}/xrdp.ini";
+          ExecStart = "${cfg.package}/bin/xrdp --nodaemon --port ${toString cfg.port} --config ${cfg.confDir}/xrdp.ini";
         };
       };
 
@@ -159,7 +164,7 @@ in
         description = "xrdp session manager";
         restartIfChanged = false; # do not restart on "nixos-rebuild switch". like "display-manager", it can have many interactive programs as children
         serviceConfig = {
-          ExecStart = "${cfg.package}/bin/xrdp-sesman --nodaemon --config ${confDir}/sesman.ini";
+          ExecStart = "${cfg.package}/bin/xrdp-sesman --nodaemon --config ${cfg.confDir}/sesman.ini";
           ExecStop  = "${pkgs.coreutils}/bin/kill -INT $MAINPID";
         };
       };