diff --git a/pkgs/tools/misc/envsubst/default.nix b/pkgs/tools/misc/envsubst/default.nix
index be563345b2c..5ecae8dbcbe 100644
--- a/pkgs/tools/misc/envsubst/default.nix
+++ b/pkgs/tools/misc/envsubst/default.nix
@@ -1,10 +1,9 @@
-{ lib, fetchFromGitHub, buildGoPackage }:
+{ lib, fetchFromGitHub, buildGoModule }:
 
-buildGoPackage rec {
+buildGoModule rec {
   pname = "envsubst";
   version = "1.2.0";
 
-  goPackagePath = "github.com/a8m/envsubst";
   src = fetchFromGitHub {
     owner = "a8m";
     repo = "envsubst";
@@ -12,6 +11,12 @@ buildGoPackage rec {
     sha256 = "0zkgjdlw3d5xh7g45bzxqspxr61ljdli8ng4a1k1gk0dls4sva8n";
   };
 
+  vendorSha256 = "sha256-pQpattmS9VmO3ZIQUFn66az8GSmB4IvYhTTCFn6SUmo=";
+
+  postInstall = ''
+    install -Dm444 -t $out/share/doc/${pname} LICENSE *.md
+  '';
+
   meta = with lib; {
     description = "Environment variables substitution for Go";
     homepage = "https://github.com/a8m/envsubst";