diff --git a/build-constraints.yaml b/build-constraints.yaml
index 15ece26a..3da8c889 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -2939,6 +2939,7 @@ expected-test-failures:
     - ghc-events # https://github.com/haskell/ghc-events/issues/9
     - graylog # 0.1.0.1 https://github.com/fpco/stackage/pull/1254
     - haskell-names # 0.7.0 https://github.com/haskell-suite/haskell-names/issues/78
+    - heterocephalus # 1.0.0.1 https://github.com/arowM/heterocephalus/issues/4
     - rematch # No issue tracker, sent e-mail to maintainer https://github.com/fpco/stackage/issues/376
     - xlsior # https://github.com/rcallahan/xlsior/issues/1