diff --git a/build-constraints.yaml b/build-constraints.yaml
index 596f9f5d..b8c8ac96 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -5362,6 +5362,9 @@ expected-test-failures:
 
     # https://github.com/commercialhaskell/stackage/issues/4644
     - triplesec
+
+    # https://github.com/commercialhaskell/stackage/issues/4646
+    - singletons
 # end of expected-test-failures
 
 # Benchmarks which are known not to build. Note that, currently we do not run