diff --git a/build-constraints.yaml b/build-constraints.yaml
index 73fd4251..1b4d7a9f 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -660,6 +660,9 @@ packages:
         # for language-ecmascript as well.
         - language-ecmascript < 0.17
 
+        # https://github.com/fpco/stackage/issues/398
+        - monoid-subclasses < 0.4
+
 # Package flags are applied to individual packages, and override the values of
 # global-flags
 package-flags: