diff --git a/tests/system_tests/hyperion/external_interaction/test_load_centre_collect_full_plan.py b/tests/system_tests/hyperion/external_interaction/test_load_centre_collect_full_plan.py
index b8b378cc8..3c409f51a 100644
--- a/tests/system_tests/hyperion/external_interaction/test_load_centre_collect_full_plan.py
+++ b/tests/system_tests/hyperion/external_interaction/test_load_centre_collect_full_plan.py
@@ -50,6 +50,8 @@
 )
 from .conftest import raw_params_from_file
 
+SAMPLE_ID = os.environ.get("ST_SAMPLE_ID", 5461074)
+
 
 @pytest.fixture
 def load_centre_collect_params():
@@ -57,7 +59,7 @@ def load_centre_collect_params():
         "tests/test_data/parameter_json_files/example_load_centre_collect_params.json"
     )
     json_dict["visit"] = os.environ.get("ST_VISIT", "cm37235-4")
-    json_dict["sample_id"] = os.environ.get("ST_SAMPLE_ID", 5461074)
+    json_dict["sample_id"] = SAMPLE_ID
     return LoadCentreCollect(**json_dict)