diff --git a/nixos/modules/services/monitoring/grafana-reporter.nix b/nixos/modules/services/monitoring/grafana-reporter.nix
index 149026d2018..827cf6322cf 100644
--- a/nixos/modules/services/monitoring/grafana-reporter.nix
+++ b/nixos/modules/services/monitoring/grafana-reporter.nix
@@ -52,7 +52,7 @@ in {
       wantedBy = ["multi-user.target"];
       after = ["network.target"];
       serviceConfig = let
-        args = lib.concatSepString " " [
+        args = lib.concatStringsSep " " [
           "-proto ${cfg.grafana.protocol}://"
           "-ip ${cfg.grafana.addr}:${toString cfg.grafana.port}"
           "-port :${toString cfg.port}"