diff --git a/lib/spack/spack/test/concretization/core.py b/lib/spack/spack/test/concretization/core.py
index 809f203d481..d33152e8ba6 100644
--- a/lib/spack/spack/test/concretization/core.py
+++ b/lib/spack/spack/test/concretization/core.py
@@ -1466,7 +1466,7 @@ def test_reuse_by_namespace(self, mutable_database, mock_packages):
 
         reuse = spack.concretize.concretize_one("libelf")
         assert reuse.installed
-        assert reuse.satisfies("@0.8.13")
+        assert reuse.satisfies("@0.8.13")  # version installed in mutable_database
 
         spack.config.set("concretizer:reuse", {"namespaces": []})
         noreuse = spack.concretize.concretize_one("libelf")