diff --git a/build-constraints.yaml b/build-constraints.yaml
index 34438847..8bf379c7 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -2597,7 +2597,7 @@ packages:
         - configurator-export
         - decidable
         - emd
-        - functor-products
+        - functor-products < 0 # https://github.com/mstksg/functor-products/issues/4
         - hamilton < 0 # 0.1.0.3 compile fail https://github.com/mstksg/hamilton/issues/9
         - hmatrix-backprop
         - hmatrix-vector-sized