diff --git a/tests/kde4.nix b/tests/kde4.nix
index dd8b84ff387..56c8acbc8dc 100644
--- a/tests/kde4.nix
+++ b/tests/kde4.nix
@@ -34,6 +34,7 @@
 
   testScript =
     ''
+      $machine->waitUntilSucceeds("pgrep plasma-desktop");
       $machine->waitForWindow(qr/plasma-desktop/);
 
       # Check that logging in has given the user ownership of devices.