diff --git a/build-constraints.yaml b/build-constraints.yaml
index 39a20ca1..d9c0d7b6 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -4752,7 +4752,7 @@ packages:
         - net-mqtt-lens
 
     "David A Roberts <d@vidr.cc> @davidar":
-        - streamt
+        - streamt < 0  # https://github.com/commercialhaskell/stackage/issues/6667
 
     "Martin Sosic <sosic.martin@gmail.com> @Martinsos":
         - strong-path