diff --git a/nixos/lib/testing-python.nix b/nixos/lib/testing-python.nix
index 3d89e5484d16c..0d3c3a89e7836 100644
--- a/nixos/lib/testing-python.nix
+++ b/nixos/lib/testing-python.nix
@@ -30,7 +30,7 @@ rec {
           # effectively mute the XMLLogger
           export LOGFILE=/dev/null
 
-          ${driver}/bin/nixos-test-driver
+          ${driver}/bin/nixos-test-driver -o $out
         '';
 
       passthru = driver.passthru // {