diff --git a/test/build.ml b/test/build.ml
new file mode 100644
index 0000000000000000000000000000000000000000..8bd1aa4e5aaf3d4f03f544b119c594eb4a41743f
--- /dev/null
+++ b/test/build.ml
@@ -0,0 +1,7 @@
+(* Testing @build attributes. *)
+
+type foo =
+  | A
+  | B of int
+  | C of foo * foo
+[@@deriving visitors { variety = "map" }]
diff --git a/test/misc.mllib b/test/misc.mllib
index 966dcbcaade015909db27267d42d9d96c9b38030..dc2c878e3b423e5b7d483dc8dd088b7d80253500 100644
--- a/test/misc.mllib
+++ b/test/misc.mllib
@@ -1,3 +1,4 @@
+build
 cloud
 delayed_tree
 dictionary