diff --git a/build-constraints.yaml b/build-constraints.yaml
index 5cc2de39..65b110d8 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -3754,6 +3754,7 @@ expected-test-failures:
     - dbus # 0.10.12 No issue tracker, e-mail sent to maintainer
     - hspec-expectations-pretty-diff # GHC 8 issue not reported upstream since issue tracker disabled
     - language-lua2 # https://github.com/mitchellwrosen/language-lua2/issues/4
+    - leapseconds-announced # https://github.com/bjornbm/leapseconds-announced/issues/5
     - picosat # https://github.com/fpco/stackage/pull/2382
     - sourcemap # https://github.com/chrisdone/sourcemap/issues/3
     - text-ldap # https://github.com/khibino/haskell-text-ldap/issues/1