diff --git a/build-constraints.yaml b/build-constraints.yaml
index 63d033f1..b727bb05 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -5377,6 +5377,7 @@ expected-test-failures:
     - crypto-pubkey # https://github.com/vincenthz/hs-crypto-pubkey/issues/23
     - doctest-discover # 0.1.0.9 https://github.com/karun012/doctest-discover/issues/22
     - graylog # 0.1.0.1 https://github.com/fpco/stackage/pull/1254
+    - xeno # 0.4 https://github.com/ocramz/xeno/issues/37
 
     # Assertion failures, these can be real bugs or just limitations
     # in the test cases.