diff --git a/cuda_core/tests/test_helpers.py b/cuda_core/tests/test_helpers.py
index abe0d62622..51cf1af3f4 100644
--- a/cuda_core/tests/test_helpers.py
+++ b/cuda_core/tests/test_helpers.py
@@ -47,6 +47,10 @@ def test_latchkernel():
     log("done")
 
 
+@pytest.mark.skipif(
+    IS_WINDOWS,
+    reason="Extremely slow on Windows (issue #1455).",
+)
 @pytest.mark.skipif(
     under_compute_sanitizer(),
     reason="Too slow under compute-sanitizer (UVM-heavy test).",