diff --git a/build-constraints.yaml b/build-constraints.yaml
index e22483c4..7ce4323b 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -3655,6 +3655,7 @@ expected-test-failures:
     - servant # https://github.com/haskell-servant/servant/issues/698
     - snap-core # https://github.com/snapframework/snap-core/issues/26
     - stm-delay # https://github.com/joeyadams/haskell-stm-delay/issues/5
+    - haddock # https://github.com/haskell/haddock/issues/634
 
 # end of expected-test-failures