diff --git a/nixos/modules/services/monitoring/prometheus/default.nix b/nixos/modules/services/monitoring/prometheus/default.nix
index 4ad13d9eac08..d85825be5057 100644
--- a/nixos/modules/services/monitoring/prometheus/default.nix
+++ b/nixos/modules/services/monitoring/prometheus/default.nix
@@ -97,7 +97,7 @@ let
     ++ (
       if (cfg.enableAgentMode) then
         [
-          "--enable-feature=agent"
+          "--agent"
         ]
       else
         [