diff --git a/api/tests/opentrons/hardware_control/instruments/test_instrument_calibration.py b/api/tests/opentrons/hardware_control/instruments/test_instrument_calibration.py
index 11f2605679f6..6aa3ca2a009a 100644
--- a/api/tests/opentrons/hardware_control/instruments/test_instrument_calibration.py
+++ b/api/tests/opentrons/hardware_control/instruments/test_instrument_calibration.py
@@ -99,9 +99,9 @@ def test_load_tip_length(
     decoy.when(calibration_storage.helpers.hash_labware_def(tip_rack_dict)).then_return(
         "asdfghjk"
     )
-    decoy.when(calibration_storage.helpers.uri_from_definition(tip_rack_dict)).then_return(
-        "def456"
-    )
+    decoy.when(
+        calibration_storage.helpers.uri_from_definition(tip_rack_dict)
+    ).then_return(LabwareUri("def456"))
 
     result = subject.load_tip_length_for_pipette(
         pipette_id="abc123", tiprack=tip_rack_definition
diff --git a/robot-server/tests/service/tip_length/test_tip_length_management.py b/robot-server/tests/service/tip_length/test_tip_length_management.py
index 78946cfeabd7..ca76e01d32ba 100644
--- a/robot-server/tests/service/tip_length/test_tip_length_management.py
+++ b/robot-server/tests/service/tip_length/test_tip_length_management.py
@@ -33,9 +33,7 @@ def test_access_tip_length_calibration(api_client, set_up_tip_length_temp_direct
     assert resp.json()["data"] == []
 
 
-def test_delete_tip_length_calibration(
-    api_client, set_up_tip_length_temp_directory
-):
+def test_delete_tip_length_calibration(api_client, set_up_tip_length_temp_directory):
     resp = api_client.delete(
         f"/calibration/tip_length?pipette_id={FAKE_PIPETTE_ID}&"
         f"tiprack_uri={WRONG_LW_HASH}"