diff --git a/test/search_api/conftest.py b/test/search_api/conftest.py
index 45bb32c3..00d1ba21 100644
--- a/test/search_api/conftest.py
+++ b/test/search_api/conftest.py
@@ -80,7 +80,7 @@ def test_search_api_mappings_data():
         },
         "Instrument": {
             "base_icat_entity": "Instrument",
-            "pid": "id",
+            "pid": ["pid", "id"],
             "name": "name",
             "facility": "facility.name",
             "datasets": {"Dataset": "datasetInstruments.dataset"},