diff --git a/collects/meta/dist-specs.rkt b/collects/meta/dist-specs.rkt
index 6c1951a457..05e8448239 100644
--- a/collects/meta/dist-specs.rkt
+++ b/collects/meta/dist-specs.rkt
@@ -661,6 +661,7 @@ plt-extras :+= (package: "deinprogramm/")
                (doc: "DMdA-lib")
 
 ;; -------------------- unstable
+mz-extras :+= (package: "data")
 mz-extras :+= (- (package: "unstable")
                  ;; should "gui" mean DrRacket or GRacket? It's not
                  ;; obvious that "framework" is only in DrRacket.