diff --git a/lib/testing.nix b/lib/testing.nix
index c8e3d7bbc97..704ee4025a5 100644
--- a/lib/testing.nix
+++ b/lib/testing.nix
@@ -142,6 +142,7 @@ rec {
     driver = runCommand "nixos-test-driver"
       { buildInputs = [ makeWrapper];
         inherit testScript;
+        preferLocalBuild = true;
       }
       ''
         mkdir -p $out/bin