diff --git a/server/server.js b/server/server.js
index 3e888c92..7db702a9 100644
--- a/server/server.js
+++ b/server/server.js
@@ -568,7 +568,7 @@ exports.entryPage = "dashboard";
                 }
 
                 // Reset Prometheus labels
-                if (monitorList[monitor.id] && monitorList[monitor.id].prometheus) {
+                if (monitorList[monitor.id] && monitorList[monitor.id].prometheus()) {
                     monitorList[monitor.id].prometheus().remove();
                 }