diff --git a/spack-environment/xl/spack.yaml b/spack-environment/xl/spack.yaml
index efd735866b2b3e94b9a7a30ec22094880e960648..b99046abbb4fa4e865a34731a8e5d02c28a83885 100644
--- a/spack-environment/xl/spack.yaml
+++ b/spack-environment/xl/spack.yaml
@@ -54,6 +54,7 @@ spack:
   - lcov
   - lhapdf
   - madx
+  - multitime
   - nano
   - nopayloadclient
   - npsim