diff --git a/packages/build-support/activate-shell b/packages/build-support/activate-shell
index eb35ff4..4615834 100644
--- a/packages/build-support/activate-shell
+++ b/packages/build-support/activate-shell
@@ -2,4 +2,4 @@ export REPO_ROOT="$(git rev-parse --show-toplevel)"
 if ! has nix_direnv_version || ! nix_direnv_version 2.1.0; then
     source_url "https://raw.githubusercontent.com/nix-community/nix-direnv/2.1.0/direnvrc" "sha256-FAT2R9yYvVg516v3LiogjIc8YfsbWbMM/itqWsm5xTA="
 fi
-use flake "${REPO_ROOT}#$(basename $PWD)"
+use flake "${REPO_ROOT}#${DEVSHELL_ATTR:-$(basename $PWD)}"