diff --git a/server/prometheus.js b/server/prometheus.js
index 775743cb5..2396368dc 100644
--- a/server/prometheus.js
+++ b/server/prometheus.js
@@ -52,7 +52,7 @@ class Prometheus {
         };
         let sanitizedTags = this.sanitizeTags(tags);
         if (sanitizedTags.length) {
-            this.monitorLabelValues.monitor_tags = sanitizedTags
+            this.monitorLabelValues.monitor_tags = sanitizedTags;
         }
     }