diff --git a/tests/unit_tests/analysis/test_es_update.py b/tests/unit_tests/analysis/test_es_update.py
index 39f97248147..e125108d502 100644
--- a/tests/unit_tests/analysis/test_es_update.py
+++ b/tests/unit_tests/analysis/test_es_update.py
@@ -177,7 +177,7 @@ def test_update_report_with_different_observation_status_from_smoother_update(
     ss = smoother_update(
         prior_ens,
         posterior_ens,
-        list(ert_config.observations.keys()),
+        experiment.observation_keys,
         ert_config.ensemble_config.parameters,
         update_settings,
         ESSettings(inversion="subspace"),