diff --git a/build-constraints.yaml b/build-constraints.yaml
index 49398757..a2a81081 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -2380,6 +2380,9 @@ expected-test-failures:
     # Requires a running PostgreSQL server
     - wai-session-postgresql
 
+    # https://github.com/twanvl/multiset/issues/7
+    - multiset
+
 # end of expected-test-failures