diff --git a/build-constraints.yaml b/build-constraints.yaml
index 972c8f6f..4f069362 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -8172,6 +8172,7 @@ expected-test-failures:
     - vivid-supercollider # 0.4.1.2 https://github.com/commercialhaskell/stackage/issues/4250
     - xml-html-qq # 0.1.0.1
     - xmlgen # 0.6.2.2 https://github.com/skogsbaer/xmlgen/issues/6
+    - pontarius-xmpp # 0.5.6.5
 
     # Recursive deps https://github.com/fpco/stackage/issues/1818
     - options