diff --git a/build-constraints.yaml b/build-constraints.yaml
index a450a570..b061a704 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -5162,7 +5162,7 @@ packages:
         - monad-control
         - monad-logger
         - monad-loops
-        - monad-time
+        - monad-time < 0.4 # https://github.com/commercialhaskell/stackage/issues/6640
         - monadloc
         - monads-tf
         - mono-traversable-instances