diff --git a/build-constraints.yaml b/build-constraints.yaml
index 9dac906b..f8914877 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -8478,6 +8478,7 @@ expected-test-failures:
     #
     - aeson-combinators # https://github.com/turboMaCk/aeson-combinators/issues/31
     - aeson-jsonpath # https://github.com/taimoorzaeem/aeson-jsonpath/issues/31
+    - atomic-css # https://github.com/seanhess/atomic-css/issues/27
     - brittany # https://github.com/commercialhaskell/stackage/issues/6465
     - cpio-conduit # Test file not in tarball https://github.com/da-x/cpio-conduit/issues/1
     - crypto-pubkey # https://github.com/vincenthz/hs-crypto-pubkey/issues/23