diff --git a/spack.yaml b/spack.yaml
index 8caaa08324958c975e3bb08d3a46a7f4da3e4cb9..02983053b9989d9863946949966de98a98c416b7 100644
--- a/spack.yaml
+++ b/spack.yaml
@@ -40,7 +40,7 @@ spack:
     - [$^mpis]
     - [$%compilers]
 
-  concretize:
+  concretizer:
     unify: when_possible
   view:
     default: