diff --git a/build-constraints.yaml b/build-constraints.yaml
index ab4125b5..aa14018e 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -7934,6 +7934,9 @@ packages:
         # https://github.com/commercialhaskell/stackage/issues/6800
         - linear < 1.22
 
+        # https://github.com/commercialhaskell/stackage/issues/6802
+        - hosc < 0.20
+
 # end of packages
 
 # Package flags are applied to individual packages, and override the values of