diff --git a/share/spack/gitlab/cloud_pipelines/stacks/e4s-oneapi/spack.yaml b/share/spack/gitlab/cloud_pipelines/stacks/e4s-oneapi/spack.yaml
index ccd6d54b5cb..dbc80589c1a 100644
--- a/share/spack/gitlab/cloud_pipelines/stacks/e4s-oneapi/spack.yaml
+++ b/share/spack/gitlab/cloud_pipelines/stacks/e4s-oneapi/spack.yaml
@@ -3,7 +3,7 @@ spack:
 
   concretizer:
     reuse: false
-    unify: false
+    unify: when_possible
 
   config:
     concretizer: clingo