diff --git a/nixos/tests/lightdm.nix b/nixos/tests/lightdm.nix
index b355081ffd67..67bd395be064 100644
--- a/nixos/tests/lightdm.nix
+++ b/nixos/tests/lightdm.nix
@@ -22,7 +22,7 @@ import ./make-test.nix ({ pkgs, ...} : {
     $machine->waitForText(qr/${user.description}/);
     $machine->screenshot("lightdm");
     $machine->sendChars("${user.password}\n");
-    $machine->waitForText(qr/^\d{2}(?::\d{2}){2} (?:AM|PM)$/m);
+    $machine->waitForWindow("^IceWM ");
     $machine->screenshot("session");
   '';
 })