diff --git a/modules/monitoring-prometheus-server.nix b/modules/monitoring-prometheus-server.nix
index 6b02d14..9aedc14 100644
--- a/modules/monitoring-prometheus-server.nix
+++ b/modules/monitoring-prometheus-server.nix
@@ -57,7 +57,7 @@ in {
     ];
 
     alertmanagers = [{
-      static_configs = [{ targets = [ "127.0.0.1:9093" ]; }];
+      static_configs = [{ targets = [ "[::1]:9093" ]; }];
     }];
 
     alertmanager = {