diff --git a/packages/sysmon.yaml b/packages/sysmon.yaml
index e945c9b..9aa0f14 100644
--- a/packages/sysmon.yaml
+++ b/packages/sysmon.yaml
@@ -92,7 +92,9 @@ template:
         power_usage: "{{ states('sensor.basement_server_power') | int }}W"
     - name: Tony Desktop Idle
       unique_id: f0ace986-a874-4fb0-ad29-8f3ebf95d8cc
-      state: "{{ (states('sensor.tony_asus_system_idle_time') | int) > (states('input_number.basement_computers_idle_time') | int * 60) }}"
+      state: >
+        {% from 'time.jinja' import time_diff %}
+        {{ (time_diff('sensor.tony_asus_last_active') | int) > (states('input_number.basement_computers_idle_time') | int * 60) }}
     - name: Tina Desktop Idle
       unique_id: 1933c638-c94b-468e-bb7a-c1c5b36c3651
       state: "{{ (states('sensor.xia_desktop_system_idle_time') | int) > (states('input_number.first_floor_computers_idle_time') | int * 60) }}"