diff --git a/build-constraints.yaml b/build-constraints.yaml
index f8a59c3b..96e0fed3 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -310,6 +310,7 @@ packages:
         - essence-of-live-coding-warp
         - pulse-simple
         - simple-affine-space
+        - has-transformers
 
     "Paul Johnson <paul@cogito.org.uk> @PaulJohnson":
         - geodetics