diff --git a/pkgs/applications/editors/emacs/elisp-packages/manual-packages/prolog/default.nix b/pkgs/applications/editors/emacs/elisp-packages/manual-packages/prolog/default.nix
index 590906d6acdb..3e804551666c 100644
--- a/pkgs/applications/editors/emacs/elisp-packages/manual-packages/prolog/default.nix
+++ b/pkgs/applications/editors/emacs/elisp-packages/manual-packages/prolog/default.nix
@@ -1,19 +1,14 @@
-{ lib, stdenv, fetchurl }:
+{ lib, trivialBuild, fetchurl }:
 
-stdenv.mkDerivation {
+trivialBuild {
   pname = "prolog-mode";
   version = "1.28";
 
   src = fetchurl {
-    url = "http://bruda.ca/_media/emacs/prolog.el";
+    url = "https://bruda.ca/_media/emacs/prolog.el";
     sha256 = "ZzIDFQWPq1vI9z3btgsHgn0axN6uRQn9Tt8TnqGybOk=";
   };
 
-  buildCommand = ''
-    mkdir -p $out/share/emacs/site-lisp/
-    cp $src $out/share/emacs/site-lisp/prolog.el
-  '';
-
   meta = {
     homepage = "https://bruda.ca/emacs/prolog_mode_for_emacs/";
     description = "Prolog mode for Emacs";