diff --git a/tests/core/test_alert_no_data.py b/tests/core/test_alert_no_data.py
index 067b880..9143308 100644
--- a/tests/core/test_alert_no_data.py
+++ b/tests/core/test_alert_no_data.py
@@ -88,7 +88,7 @@ class _Session:
 
 def _state(**kw):
     base = dict(state=AlertStateEnum.firing, last_sample_at=None, sample_interval_s=None,
-                no_data_since=None, consecutive_failure_count=0, consecutive_ok_count=0)
+                no_data_since=None, consecutive_failure_count=0, consecutive_ok_count=0, last_value=None)
     return NS(**{**base, **kw})