diff --git a/pylabrobot/resources/tip_rack.py b/pylabrobot/resources/tip_rack.py
index fdcfc666de4..c7ac312c1d1 100644
--- a/pylabrobot/resources/tip_rack.py
+++ b/pylabrobot/resources/tip_rack.py
@@ -46,8 +46,8 @@ def __init__(
 
     super().__init__(
       name,
-      size_x=size_y,
-      size_y=size_x,
+      size_x=size_x,
+      size_y=size_y,
       size_z=size_z,
       category=category,
       metadata=metadata,
diff --git a/pylabrobot/resources/tip_rack_tests.py b/pylabrobot/resources/tip_rack_tests.py
index 6ad96a8195f..5bc9c48c328 100644
--- a/pylabrobot/resources/tip_rack_tests.py
+++ b/pylabrobot/resources/tip_rack_tests.py
@@ -48,3 +48,32 @@ def test_set_tip_state_fills_with_named_tips(self):
     spot = rack.get_item("A1")
     tip = spot.tracker.get_tip()
     self.assertIsNotNone(tip.name)
+
+
+class TipSpotSizeTests(unittest.TestCase):
+  """Tests that a tip spot keeps the footprint it was created with."""
+
+  @staticmethod
+  def _make_tip(name: str) -> Tip:
+    return Tip(
+      name=name,
+      has_filter=False,
+      total_tip_length=50.0,
+      maximal_volume=300.0,
+      fitting_depth=8.0,
+    )
+
+  def test_size_x_and_size_y_are_not_transposed(self):
+    spot = TipSpot(name="spot", size_x=8.0, size_y=5.0, size_z=2.0, make_tip=self._make_tip)
+
+    self.assertEqual(spot.get_size_x(), 8.0)
+    self.assertEqual(spot.get_size_y(), 5.0)
+    self.assertEqual(spot.center(), Coordinate(4.0, 2.5, 0.0))
+
+  def test_serialization_round_trip_preserves_footprint(self):
+    spot = TipSpot(name="spot", size_x=8.0, size_y=5.0, size_z=2.0, make_tip=self._make_tip)
+
+    round_tripped = TipSpot.deserialize(spot.serialize())
+
+    self.assertEqual(round_tripped.get_size_x(), spot.get_size_x())
+    self.assertEqual(round_tripped.get_size_y(), spot.get_size_y())