diff --git a/build-constraints.yaml b/build-constraints.yaml
index a50debda..c86dbd79 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -2751,7 +2751,7 @@ packages:
         - monad-peel
         - NineP
         - Network-NineP
-        - pontarius-xmpp
+        - pontarius-xmpp < 0 # fails to build
         - stringprep
         - ranges