diff --git a/build-constraints.yaml b/build-constraints.yaml
index 24fc503c..ba9a1df1 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -5958,6 +5958,7 @@ expected-test-failures:
     - kawhi # https://github.com/commercialhaskell/stackage/issues/4512
     - loopbreaker # https://github.com/polysemy-research/loopbreaker/issues/10
     - nettle # https://github.com/stbuehler/haskell-nettle/issues/10
+    - persistent-mtl # https://github.com/commercialhaskell/stackage/issues/6036
     - persistent-sqlite # https://github.com/yesodweb/persistent/issues/989
     - haskell-src-exts # https://github.com/commercialhaskell/stackage/issues/5151
     - simple-vec3 # https://github.com/commercialhaskell/stackage/pull/5410