diff --git a/testing/async_reduce.cu b/testing/async_reduce.cu
index 5987fe6ae..73224bac3 100644
--- a/testing/async_reduce.cu
+++ b/testing/async_reduce.cu
@@ -973,6 +973,7 @@ struct test_async_reduce_allocator_on_then_after
     );
 
     KNOWN_FAILURE;
+#if 0
     // FIXME: The below fails because you can't combine allocator attachment,
     // `.on`, and `.after`.
     ASSERT_EQUAL_QUIET(stream1, f2.stream().native_handle());
@@ -986,6 +987,7 @@ struct test_async_reduce_allocator_on_then_after
 
     thrust::cuda_cub::throw_on_error(cudaStreamDestroy(stream0));
     thrust::cuda_cub::throw_on_error(cudaStreamDestroy(stream1));
+#endif
   }
 };
 DECLARE_GENERIC_SIZED_UNITTEST_WITH_TYPES(