diff --git a/build-constraints.yaml b/build-constraints.yaml
index c57509a7..4a84e9b8 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -2019,7 +2019,7 @@ packages:
         - hxt-tagsoup
         - hexpat
         - digits
-        - unification-fd
+        - unification-fd < 0  # https://github.com/commercialhaskell/stackage/issues/5827
         - logict
         - leveldb-haskell
         - system-argv0