diff --git a/build-constraints.yaml b/build-constraints.yaml
index 191bab50..e313aed6 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -3710,6 +3710,7 @@ expected-haddock-failures:
     - metrics # https://github.com/iand675/metrics/issues/5
     - text-generic-pretty # https://github.com/fpco/stackage/pull/2160
     - dsp # https://github.com/fpco/stackage/issues/2563
+    - xml-to-json-fast # https://github.com/sinelaw/xml-to-json-fast/issues/5
 
     # Haddock bugs
     - swagger2 # https://github.com/GetShopTV/swagger2/issues/66