diff --git a/build-constraints.yaml b/build-constraints.yaml
index d3b4f57e..a9794e25 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -2543,7 +2543,7 @@ packages:
         - abstract-par
         - atomic-primops
         - base-compat-batteries
-        - base-orphans
+        - base-orphans < 0.9  # https://github.com/commercialhaskell/stackage/issues/6903
         - bifunctor-classes-compat
         - chaselev-deque
         - code-page