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-rw-r--r--nixos/modules/services/monitoring/prometheus/alertmanager.nix4
1 files changed, 2 insertions, 2 deletions
diff --git a/nixos/modules/services/monitoring/prometheus/alertmanager.nix b/nixos/modules/services/monitoring/prometheus/alertmanager.nix
index a9c0ce4ed6cb..da2cd02eaa3b 100644
--- a/nixos/modules/services/monitoring/prometheus/alertmanager.nix
+++ b/nixos/modules/services/monitoring/prometheus/alertmanager.nix
@@ -62,8 +62,8 @@ in {
       };
 
       listenAddress = mkOption {
-        type = types.nullOr types.str;
-        default = null;
+        type = types.str;
+        default = "";
         description = ''
           Address to listen on for the web interface and API.
         '';