diff --git a/nixos/modules/services/monitoring/prometheus/exporters.nix b/nixos/modules/services/monitoring/prometheus/exporters.nix
index 2dc12a221bf0..50200da82e04 100644
--- a/nixos/modules/services/monitoring/prometheus/exporters.nix
+++ b/nixos/modules/services/monitoring/prometheus/exporters.nix
@@ -230,6 +230,7 @@ let
     in
     mkIf conf.enable {
       warnings = conf.warnings or [];
+      assertions = conf.assertions or [];
       users.users."${name}-exporter" = (mkIf (conf.user == "${name}-exporter" && !enableDynamicUser) {
         description = "Prometheus ${name} exporter service user";
         isSystemUser = true;
diff --git a/nixos/tests/prometheus-exporters.nix b/nixos/tests/prometheus-exporters.nix
index 56569c4de2c8..a0f895d4cb2d 100644
--- a/nixos/tests/prometheus-exporters.nix
+++ b/nixos/tests/prometheus-exporters.nix
@@ -435,7 +435,6 @@ let
     json = {
       exporterConfig = {
         enable = true;
-        url = "http://localhost";
         configFile = pkgs.writeText "json-exporter-conf.json" (builtins.toJSON {
           modules = {
             default = {