diff --git a/build-constraints.yaml b/build-constraints.yaml
index d8a7ccc2..435ec3b8 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -6765,6 +6765,9 @@ packages:
       - singletons-th < 3.1
       - th-desugar < 1.13
 
+      # https://github.com/commercialhaskell/stackage/issues/6265
+      - attoparsec < 0.14.2
+
 # end of packages
 
 # Package flags are applied to individual packages, and override the values of