diff --git a/packages/ubase/ubase.0.05/opam b/packages/ubase/ubase.0.05/opam
index 066f8cacc52..09463b142af 100644
--- a/packages/ubase/ubase.0.05/opam
+++ b/packages/ubase/ubase.0.05/opam
@@ -12,7 +12,7 @@ depends: [
   "ocaml" {>= "4.05.0"}
 ]
 build: [
-  ["dune" "subst"] {pinned}
+  ["dune" "subst"] {dev}
   [
     "dune"
     "build"