diff --git a/tests/kernels/test_pinned_tensor.py b/tests/kernels/test_pinned_tensor.py
index e61108fd..9e105bb5 100644
--- a/tests/kernels/test_pinned_tensor.py
+++ b/tests/kernels/test_pinned_tensor.py
@@ -115,17 +115,21 @@ def test_host_device_ptr_is_identity_under_uva():
     if not torch.cuda.is_available():
         pytest.skip("needs CUDA")
 
-    from freetoken.kernel.pinned import _host_ptr_identity, _load_pinned_extension
+    from freetoken.kernel.pinned import (
+        _host_ptr_identity,
+        _load_pinned_extension,
+        alloc_pinned_tensor,
+    )
 
     torch.cuda.init()
     if not _host_ptr_identity():
         pytest.skip("non-UVA platform: host_device_ptr rejects unregistered memory instead")
-    # Under UVA cudaHostGetDevicePointer degenerates to identity for any host pointer
-    # (no registration validation); rejection of pageable memory only exists on
-    # non-identity platforms (Windows/WDDM), where the translation is real.
-    pageable = torch.empty(64, dtype=torch.uint8)
+    # CUDA 13 rejects unregistered pageable pointers even on Linux/UVA. Exercise
+    # only the supported pinned + mapped contract; pageable-pointer behavior is
+    # outside host_device_ptr's contract.
+    pinned = alloc_pinned_tensor(64, dtype=torch.uint8)
     ext = _load_pinned_extension()
-    assert ext.host_device_ptr(pageable.data_ptr()) == pageable.data_ptr()
+    assert ext.host_device_ptr(pinned.data_ptr()) == pinned.data_ptr()
 
 
 def test_host_bank_pin_registers_and_translates():