diff --git a/apsbss/core.py b/apsbss/core.py
index 275440a..c5988c3 100644
--- a/apsbss/core.py
+++ b/apsbss/core.py
@@ -545,7 +545,7 @@ def endDate(self) -> datetime.datetime:
         return iso2dt(self._raw["endTime"])
 
     @property
-    def run_id(self) -> int | None:
+    def run_id(self) -> int:
         """Run identifier, if provided from server, or None."""
         return self._raw.get("runId")