diff --git a/tests/kde4.nix b/tests/kde4.nix
index 3b91b738cb7..379863f6a22 100644
--- a/tests/kde4.nix
+++ b/tests/kde4.nix
@@ -38,6 +38,9 @@
     ''
       $machine->waitForWindow(qr/plasma-desktop/);
 
+      # Check that logging in has given the user ownership of devices.
+      $machine->mustSucceed("getfacl /dev/snd/timer | grep -q alice");
+
       $machine->execute("su - alice -c 'DISPLAY=:0.0 kwrite /var/log/messages &'");
       $machine->execute("su - alice -c 'DISPLAY=:0.0 konqueror http://localhost/ &'");