diff --git a/build-constraints.yaml b/build-constraints.yaml
index a05f78e5..a2d11581 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -7988,6 +7988,9 @@ skipped-tests:
 
     # ???
     - incremental-parser # 0.5.0.3 Main: executable not found
+
+    # missing package
+    - unordered-containers  # https://github.com/commercialhaskell/stackage/issues/6525
 # end of skipped-tests
 
 # Tests listed in expected-test-failures configure correctly but may fail to run