diff --git a/pkgs/servers/maddy/default.nix b/pkgs/servers/maddy/default.nix
index c5fa1b5e670a..88631112fa1c 100644
--- a/pkgs/servers/maddy/default.nix
+++ b/pkgs/servers/maddy/default.nix
@@ -1,4 +1,4 @@
-{ lib, buildGoModule, fetchFromGitHub }:
+{ lib, buildGoModule, fetchFromGitHub, coreutils }:
 
 buildGoModule rec {
   pname = "maddy";
@@ -17,6 +17,18 @@ buildGoModule rec {
 
   subPackages = [ "cmd/maddy" "cmd/maddyctl" ];
 
+  postInstall = ''
+    mkdir -p $out/lib/systemd/system
+
+    substitute dist/systemd/maddy.service $out/lib/systemd/system/maddy.service \
+      --replace "/usr/bin/maddy" "$out/bin/maddy" \
+      --replace "/bin/kill" "${coreutils}/bin/kill"
+
+    substitute dist/systemd/maddy@.service $out/lib/systemd/system/maddy@.service \
+      --replace "/usr/bin/maddy" "$out/bin/maddy" \
+      --replace "/bin/kill" "${coreutils}/bin/kill"
+  '';
+
   meta = with lib; {
     description = "Composable all-in-one mail server";
     homepage = "https://foxcpp.dev/maddy";