diff --git a/build-constraints.yaml b/build-constraints.yaml
index 88941876..e78646d7 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -8034,6 +8034,7 @@ expected-test-failures:
     - haskeline # 0.8.2 https://github.com/commercialhaskell/stackage/issues/5439
     - haskoin-core
     - hgeometry-combinatorial # 0.14
+    - hpack # 0.35 https://github.com/commercialhaskell/stackage/issues/6725
     - hruby # 0.5.0.0
     - hspec-golden-aeson # 0.9.0.0
     - justified-containers # 0.3.0.0