diff --git a/build-constraints.yaml b/build-constraints.yaml
index b5bae37c..fd77671c 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -656,7 +656,7 @@ packages:
         - bench-show
         - monad-recorder
         - packcheck
-        - streamly
+        - streamly < 0.8.1 # https://github.com/commercialhaskell/stackage/issues/6335
         - unicode-transforms
         - xls