1 files changed, 2 insertions, 1 deletions
diff --git a/nixpkgs/nixos/modules/services/monitoring/prometheus/exporters/postfix.nix b/nixpkgs/nixos/modules/services/monitoring/prometheus/exporters/postfix.nix
index efe78ebcba86..f40819e826b0 100644
--- a/nixpkgs/nixos/modules/services/monitoring/prometheus/exporters/postfix.nix
+++ b/nixpkgs/nixos/modules/services/monitoring/prometheus/exporters/postfix.nix
@@ -1,4 +1,4 @@
-{ config, lib, pkgs }:
+{ config, lib, pkgs, options }:
 
 with lib;
 
@@ -62,6 +62,7 @@ in
   };
   serviceOpts = {
     serviceConfig = {
+      DynamicUser = false;
       ExecStart = ''
         ${pkgs.prometheus-postfix-exporter}/bin/postfix_exporter \
           --web.listen-address ${cfg.listenAddress}:${toString cfg.port} \