diff --git a/pkgs/servers/monitoring/alertmanager-bot/default.nix b/pkgs/servers/monitoring/alertmanager-bot/default.nix
index 9fb364de1915..2d36dcb8e1d5 100644
--- a/pkgs/servers/monitoring/alertmanager-bot/default.nix
+++ b/pkgs/servers/monitoring/alertmanager-bot/default.nix
@@ -17,11 +17,9 @@ buildGoModule rec {
     sed "s;/templates/default.tmpl;$out/share&;" -i cmd/alertmanager-bot/main.go
   '';
 
-  preBuild = ''
-    export buildFlagsArray=(
-      "-ldflags=-s -w -X main.Version=v${version} -X main.Revision=${src.rev}"
-    )
-  '';
+  ldflags = [
+    "-s" "-w" "-X main.Version=v${version}" "-X main.Revision=${src.rev}"
+  ];
 
   postInstall = ''
     install -Dm644 -t $out/share/templates $src/default.tmpl