diff --git a/build-constraints.yaml b/build-constraints.yaml
index 5d76b1c1..332e6b12 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -3354,6 +3354,9 @@ packages:
         # https://github.com/haskell/parsec/issues/88
         - parsec < 3.1.12
 
+        # https://github.com/fpco/stackage/issues/3269
+        - unordered-containers < 0.2.9
+
 # end of packages
 
 # Package flags are applied to individual packages, and override the values of