diff --git a/build-constraints.yaml b/build-constraints.yaml
index 73beb1ab..c83fd12f 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -6310,6 +6310,7 @@ packages:
         - X11 < 0 # Cabal 3?
         - HSet < 0 # Duplicate Hashable instance
         - data-diverse-lens < 0 # "The liberal coverage condition fails"
+        - xmlbf < 0 # MonadFail
 
         # Round 2 transitive from Some more failures
         - Clipboard < 0 # via X11