diff --git a/nixos/modules/services/x11/display-managers/default.nix b/nixos/modules/services/x11/display-managers/default.nix
index 7fc8db95a485..d910ac566d87 100644
--- a/nixos/modules/services/x11/display-managers/default.nix
+++ b/nixos/modules/services/x11/display-managers/default.nix
@@ -122,10 +122,10 @@ let
         done
 
         if test -d ${pkg}/share/xsessions; then
-          ${xorg.lndir}/bin/lndir ${pkg}/share/xsessions $out/share/xsessions
+          ${pkgs.buildPackages.xorg.lndir}/bin/lndir ${pkg}/share/xsessions $out/share/xsessions
         fi
         if test -d ${pkg}/share/wayland-sessions; then
-          ${xorg.lndir}/bin/lndir ${pkg}/share/wayland-sessions $out/share/wayland-sessions
+          ${pkgs.buildPackages.xorg.lndir}/bin/lndir ${pkg}/share/wayland-sessions $out/share/wayland-sessions
         fi
       '') cfg.displayManager.sessionPackages}
     '';
diff --git a/nixos/modules/system/boot/systemd-lib.nix b/nixos/modules/system/boot/systemd-lib.nix
index 2dbf15031a08..6c4d27018eed 100644
--- a/nixos/modules/system/boot/systemd-lib.nix
+++ b/nixos/modules/system/boot/systemd-lib.nix
@@ -4,7 +4,7 @@ with lib;
 
 let
   cfg = config.systemd;
-  lndir = "${pkgs.xorg.lndir}/bin/lndir";
+  lndir = "${pkgs.buildPackages.xorg.lndir}/bin/lndir";
 in rec {
 
   shellEscape = s: (replaceChars [ "\\" ] [ "\\\\" ] s);