diff --git a/modules/prometheus/alert-rules.nix b/modules/prometheus/alert-rules.nix
index 556071b8..a4846732 100644
--- a/modules/prometheus/alert-rules.nix
+++ b/modules/prometheus/alert-rules.nix
@@ -24,10 +24,10 @@ lib.mapAttrsToList
     #   description = "Configurations of AlertManager cluster instances are out of sync.";
     # };
 
-    #alert_manager_e2e_dead_man_switch = {
-    #  condition = "vector(1)";
-    #  description = "Prometheus DeadManSwitch is an always-firing alert. It's used as an end-to-end test of Prometheus through the Alertmanager.";
-    #};
+    alert_manager_e2e_dead_man_switch = {
+      condition = "vector(1)";
+      description = "Prometheus DeadManSwitch is an always-firing alert. It's used as an end-to-end test of Prometheus through the Alertmanager.";
+    };
 
     # prometheus_not_connected_to_alertmanager = {
     #   condition = "prometheus_notifications_alertmanagers_discovered < 1";