diff --git a/spack-environment/packages.yaml b/spack-environment/packages.yaml
index c58d8e82a946e262b3f618234fc2ba7cefff216c..a49e14d175ca13ad0066ffaa238e5929302369e0 100644
--- a/spack-environment/packages.yaml
+++ b/spack-environment/packages.yaml
@@ -116,6 +116,7 @@ packages:
   fastjet:
     require:
     - '@3.4.0'
+    - plugins=cxx
   fjcontrib:
     require:
     - '@1.051'