diff --git a/build-constraints.yaml b/build-constraints.yaml
index 0cd894c9..9cd5fa31 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -9108,6 +9108,7 @@ expected-test-failures:
     - mfsolve # https://github.com/commercialhaskell/stackage/issues/6379
     - multiarg # 0.30.0.10
     - parameterized # 0.5.0.0 https://github.com/commercialhaskell/stackage/issues/5746
+    - primitive-unlifted # 2.1.0.0 https://github.com/haskell-primitive/primitive-unlifted/issues/42
     - protobuf # 0.2.1.4
     - quickcheck-state-machine # 0.8.0 https://github.com/stevana/quickcheck-state-machine/issues/32
     - record-wrangler # 0.1.1.0