diff --git a/infrastructure/grafana/provisioning/alerting/alerts.yml b/infrastructure/grafana/provisioning/alerting/alerts.yml
index 92e0e90..42594e5 100644
--- a/infrastructure/grafana/provisioning/alerting/alerts.yml
+++ b/infrastructure/grafana/provisioning/alerting/alerts.yml
@@ -60,7 +60,7 @@ groups:
             relativeTimeRange: { from: 600, to: 0 }
             datasourceUid: prometheus
             model:
-              expr: sum(rate(http_request_duration_seconds_count{status=~"5.."}[5m])) / sum(rate(http_request_duration_seconds_count[5m])) * 100
+              expr: sum(rate(http_request_duration_seconds_count{status=~"5.."}[5m])) / clamp_min(sum(rate(http_request_duration_seconds_count[5m])), 0.001) * 100
               instant: true
           - refId: B
             datasourceUid: __expr__