diff --git a/configs/workhorse/prometheus.nix b/configs/workhorse/prometheus.nix
index 574c0ed..5d3a685 100644
--- a/configs/workhorse/prometheus.nix
+++ b/configs/workhorse/prometheus.nix
@@ -13,7 +13,7 @@
   services.prometheus = {
     enable = true;
     # keep data for 30 days
-    extraFlags = ["--storage.tsdb.retention.time=30d"];
+    extraFlags = [ "--storage.tsdb.retention.time=30d" ];
     scrapeConfigs = [
       {
         job_name = "nginx";