diff --git a/applications/prometheus.nix b/applications/prometheus.nix
index e4fd5e0..207863b 100644
--- a/applications/prometheus.nix
+++ b/applications/prometheus.nix
@@ -30,6 +30,7 @@ in {
 
       other_nodes = mkOption {
         type = types.listOf types.str;
+        default = [];
         description = ''
           To add other nodes outside of nix, specify ip and port that server should listen to here
         '';