diff --git a/build-constraints.yaml b/build-constraints.yaml
index 8bc7d69b..992598c8 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -4447,6 +4447,7 @@ skipped-tests:
 expected-test-failures:
 
     # GHC 8.4
+    - concurrent-extra # https://github.com/basvandijk/concurrent-extra/issues/12
     - doctest # https://github.com/sol/doctest/issues/198
     - transformers-compat # https://github.com/ekmett/transformers-compat/issues/32