diff --git a/build-constraints.yaml b/build-constraints.yaml
index 72cbe70d..e9f3257a 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -8541,6 +8541,7 @@ expected-test-failures:
     - heist # GHC 9.8.1
     - hweblib # 0.6.3 https://github.com/aycanirican/hweblib/issues/3
     - inline-r # 1.0.1 https://github.com/tweag/HaskellR/issues/371
+    - leancheck-instances # 0.0.5 https://github.com/rudymatela/leancheck-instances/issues/3
     - leveldb-haskell
     - lifted-base # 0.2.3.12 compile fail
     - mfsolve # https://github.com/commercialhaskell/stackage/issues/6379