diff --git a/test/null/test_multitensor.py b/test/null/test_multitensor.py
index 117f7c3937..6161f5394b 100644
--- a/test/null/test_multitensor.py
+++ b/test/null/test_multitensor.py
@@ -66,16 +66,17 @@ class TestMultiRamUsage(unittest.TestCase):
     self.assertUsed(256 * 4)  # TODO: can be zero
 
   def test_zeros_per_device(self):
-    _ = Tensor.zeros(self.N, self.N).contiguous().realize()
+    _ = Tensor.zeros(self.N, self.N, device="NULL").contiguous().realize()
     self.assertDeviceUsed({"NULL": self.N*self.N*4})
 
   def test_zeros_del_per_device(self):
-    _ = Tensor.zeros(self.N, self.N).contiguous().realize()
+    _ = Tensor.zeros(self.N, self.N, device="NULL").contiguous().realize()
     del _
     self.assertDeviceUsed({"NULL": 0})
 
   def test_zeros_copy_per_device(self):
-    _ = Tensor.zeros(self.N, self.N).contiguous().to(("NULL:1", "NULL:2")).realize()
+    devices_2 = ("NULL:1", "NULL:2")
+    _ = Tensor.zeros(self.N, self.N).contiguous().to(devices_2).realize()
     self.assertDeviceUsed({"NULL:1": self.N*self.N*4, "NULL:2": self.N*self.N*4})
 
   def test_zeros_shard_per_device(self):
@@ -85,7 +86,7 @@ class TestMultiRamUsage(unittest.TestCase):
 
   def test_sharded_memory_replicated_per_device(self):
     devices_4 = tuple(f"NULL:{i+1}" for i in range(4))
-    X = Tensor.ones(256).contiguous().realize()
+    X = Tensor.ones(256, device="NULL").contiguous().realize()
     self.assertDeviceUsed({"NULL": 256*4})
     X.shard_(devices_4).realize()
     for d in devices_4: