diff --git a/roles/prometheus/templates/prometheus/alert.rules.yml.j2 b/roles/prometheus/templates/prometheus/alert.rules.yml.j2
index 6be52589..8d9bfb04 100644
--- a/roles/prometheus/templates/prometheus/alert.rules.yml.j2
+++ b/roles/prometheus/templates/prometheus/alert.rules.yml.j2
@@ -80,7 +80,7 @@ groups:
       description: "https://grafana.crans.org/d/qtbg59mZz/alimentation"
 
   - alert: UpsTemperatureWarning
-    expr: (xupsEnvRemoteTemp < 10) or (xupsEnvRemoteTemp > 20)
+    expr: (xupsEnvRemoteTemp < 10) or (xupsEnvRemoteTemp > 24)
     for: 5m
     labels:
       severity: warning