diff --git a/build-constraints.yaml b/build-constraints.yaml
index 4b56646c..01123553 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -7955,7 +7955,7 @@ packages:
         - th-desugar < 1.18
 
         # https://github.com/commercialhaskell/stackage/issues/7627
-        # hosc < 0.21
+        - hosc < 0.21
 
         # https://github.com/commercialhaskell/stackage/issues/7635
         - singletons-base < 3.5