diff --git a/build-constraints.yaml b/build-constraints.yaml
index 9844b977..347470f8 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -3845,6 +3845,9 @@ expected-test-failures:
     # https://github.com/fcomb/pkcs10-hs/issues/2
     - pkcs10
 
+    # https://github.com/simonmichael/hledger/issues/596
+    - hledger-lib
+
     # https://github.com/romanb/wai-route/issues/5
     - wai-route