diff --git a/build-constraints.yaml b/build-constraints.yaml
index 267f7d97..f83c6fda 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -8929,6 +8929,7 @@ expected-test-failures:
     - hspec-junit-formatter # https://github.com/freckle/hspec-junit-formatter/issues/14
     - persistent # https://github.com/commercialhaskell/stackage/issues/6037
     - reanimate-svg # https://github.com/commercialhaskell/stackage/issues/5688
+    - rzk
     - wai-saml2 # https://github.com/mbg/wai-saml2/issues/44
 
     # Testcase failures, or other runtime failures.