diff --git a/spack-environment/dbg/spack.yaml b/spack-environment/dbg/spack.yaml
index ba53572ed483ad4fb868f170ec7712365a524278..b1043ab706b0b373a9a8377a01b243ca6cc0cbd0 100644
--- a/spack-environment/dbg/spack.yaml
+++ b/spack-environment/dbg/spack.yaml
@@ -2,6 +2,8 @@ spack:
   include:
   - ../concretizer.yaml
   - ../packages.yaml
+  concretizer:
+    unify: true
   config:
     install_missing_compilers: false
   specs:
diff --git a/spack-environment/prod/spack.yaml b/spack-environment/prod/spack.yaml
index 895e21bacfaa5926ad139637b1d5f06abb48a4fb..6abb6d77df8cecf72067e5f7281506143644396f 100644
--- a/spack-environment/prod/spack.yaml
+++ b/spack-environment/prod/spack.yaml
@@ -2,6 +2,8 @@ spack:
   include:
   - ../concretizer.yaml
   - ../packages.yaml
+  concretizer:
+    unify: true
   config:
     install_missing_compilers: false
   specs: