diff --git a/build-constraints.yaml b/build-constraints.yaml
index 837eaf7f..737ba95c 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -1029,7 +1029,7 @@ packages:
     "Mario Blazevic <blamario@protonmail.com> @blamario":
         - monad-parallel
         - monad-coroutine
-        - monoid-subclasses
+        - monoid-subclasses < 1.1 # https://github.com/commercialhaskell/stackage/issues/5900
         - rank2classes
         - input-parsers
         - incremental-parser