diff --git a/tests/test_accelerator.py b/tests/test_accelerator.py
index ebab8a8c057..6ac346c0cc6 100644
--- a/tests/test_accelerator.py
+++ b/tests/test_accelerator.py
@@ -259,7 +259,9 @@ def noop(*args, **kwargs):
             pass
 
         with (
-            patch(f"torch.{torch_device}.set_device", noop),
+            # Some backends such as MPS do not expose a module-level `set_device`.
+            # This test only exercises env var parsing, so a synthetic attribute is enough.
+            patch(f"torch.{torch_device}.set_device", noop, create=True),
             patch_environment(ACCELERATE_TORCH_DEVICE=f"{torch_device}:64"),
         ):
             accelerator = Accelerator()