diff --git a/build-constraints.yaml b/build-constraints.yaml
index 592f5dd6..f54d241e 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -216,6 +216,7 @@ packages:
 
     "Richard Cook <rcook@rcook.org> @rcook":
         - hidden-char
+        - oset
         - req-url-extra
         - sexpr-parser