diff --git a/build-constraints.yaml b/build-constraints.yaml
index 3228cdcb..06aa6199 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -3082,7 +3082,7 @@ packages:
     "Alex Biehl <alexbiehl@gmail.com> @alexbiehl":
         - haddock-library
         - haddock-api
-        # - haddock # https://github.com/haskell/haddock/issues/629
+        - haddock
 
     # If you stop maintaining a package you can move it here.
     # It will then be disabled if it starts causing problems.