diff --git a/build-constraints.yaml b/build-constraints.yaml
index b56a2b91..1ea03f4e 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -7958,6 +7958,9 @@ packages:
 
         # https://github.com/commercialhaskell/stackage/issues/7611
         - th-desugar < 1.18
+
+        # https://github.com/commercialhaskell/stackage/issues/7627
+        - hosc < 0.21
     # end of Stackage upper bounds
 # end of packages