diff --git a/nixos/modules/services/display-managers/gdm.nix b/nixos/modules/services/display-managers/gdm.nix
index 38b9f919bab27..79eb5b4537ccd 100644
--- a/nixos/modules/services/display-managers/gdm.nix
+++ b/nixos/modules/services/display-managers/gdm.nix
@@ -44,6 +44,10 @@ let
   defaultSessionName = config.services.displayManager.defaultSession;
 
   setSessionScript = pkgs.callPackage ../x11/display-managers/account-service-util.nix { };
+
+  greeterEnvFile = pkgs.writeText "gdm-greeter-env" ''
+    DCONF_PROFILE=gdm
+  '';
 in
 
 {
@@ -452,6 +456,12 @@ in
               settings.conffile = "/etc/pam/environment";
               settings.readenv = 0;
             }
+            {
+              name = "env-greeter";
+              control = "required";
+              modulePath = "${config.security.pam.package}/lib/security/pam_env.so";
+              settings.envfile = greeterEnvFile;
+            }
             {
               name = "systemd";
               control = "optional";