diff --git a/kubernetes/apps/monitoring-rules/prometheusrule-netbird-availability.yaml b/kubernetes/apps/monitoring-rules/prometheusrule-netbird-availability.yaml
index 0a9b47d0..4533a044 100644
--- a/kubernetes/apps/monitoring-rules/prometheusrule-netbird-availability.yaml
+++ b/kubernetes/apps/monitoring-rules/prometheusrule-netbird-availability.yaml
@@ -58,7 +58,7 @@ spec:
           expr: |
             probe_success{job="blackbox-tcp-relays"} == 0
             or
-            probe_success{job="blackbox-http", instance=~"http://proxy-[12].renner.uno:9000/health"} == 0
+            probe_success{job="blackbox-http", instance=~"http://proxy-[12]\\.renner\\.uno:9000/health"} == 0
           for: 15m
           labels:
             severity: warning