diff --git a/build-constraints.yaml b/build-constraints.yaml
index 9905e0f9..30b46c0a 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -48,6 +48,7 @@ packages:
         - exception-transformers
         - mainland-pretty
         - ref-fd
+        - ref-tf
         - srcloc
         - symbol