diff --git a/custom_components/hikvision_axpro/__init__.py b/custom_components/hikvision_axpro/__init__.py
index a9bb101..1ba9803 100644
--- a/custom_components/hikvision_axpro/__init__.py
+++ b/custom_components/hikvision_axpro/__init__.py
@@ -265,7 +265,7 @@ def _update_data(self) -> None:
             self.sub_systems = {}
             for subsys in subsys_arr:
                 self.sub_systems[subsys.id] = subsys
-                if self.use_sub_systems and subsys.id is not 1:
+                if self.use_sub_systems and subsys.id != 1:
                     continue
                 if subsys.alarm:
                     status = STATE_ALARM_TRIGGERED