diff --git a/nix/tests/vm-test/default.nix b/nix/tests/vm-test/default.nix
index 24c3957..598d568 100644
--- a/nix/tests/vm-test/default.nix
+++ b/nix/tests/vm-test/default.nix
@@ -142,9 +142,11 @@ let
         scp -P 20022 $ssh_opts -r ${binaryCache} vagrant@localhost:binaryCache
       '';
       install = ''
-        python3 -m http.server -d binaryCache 8000 &
+        pushd binaryCache
+        python3 -m http.server 8000 &
         server_pid=$!
         trap "kill $server_pid" EXIT
+        popd
         sleep 1
         RUST_BACKTRACE="full" ./nix-installer install \
             --use-substituters \