diff --git a/source/dyaml/composer.d b/source/dyaml/composer.d
index e7b083a..6d0692a 100644
--- a/source/dyaml/composer.d
+++ b/source/dyaml/composer.d
@@ -382,7 +382,8 @@
 }
 
 // Provide good error message on multiple keys (which JSON supports)
-@safe unittest
+// DUB: This unittest is `@safe` from v2.100 as `message` was made `@safe`, not before
+unittest
 {
     import dyaml.loader : Loader;