diff --git a/build-constraints.yaml b/build-constraints.yaml
index 75556a6f..99fd8a88 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -4122,7 +4122,7 @@ packages:
         - effectful < 0 # via effectful-core, https://github.com/commercialhaskell/stackage/issues/6843
         - effectful-core < 0 # https://github.com/commercialhaskell/stackage/issues/6843
         - effectful-plugin < 0
-        - effectful-th
+        - effectful-th < 0 # via effectful-core, https://github.com/commercialhaskell/stackage/issues/6843
 
     "Stevan Andjelkovic <stevan.andjelkovic@here.com> @stevana":
         - quickcheck-state-machine