diff --git a/build-constraints.yaml b/build-constraints.yaml
index dd9fa2b6..cf71f039 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -5197,6 +5197,8 @@ packages:
       # (doctest < 0.17)
       - numhask < 0.8.0.0
 
+      # https://github.com/commercialhaskell/stackage/issues/6071
+      - hosc < 0.19
 # end of packages
 
 # Package flags are applied to individual packages, and override the values of