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 3e804551666c..41c9363fbf4a 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
@@ -1,14 +1,24 @@
-{ lib, trivialBuild, fetchurl }:
+{
+  lib,
+  melpaBuild,
+  fetchurl,
+}:
 
-trivialBuild {
+melpaBuild {
   pname = "prolog-mode";
+  ename = "prolog";
   version = "1.28";
 
   src = fetchurl {
     url = "https://bruda.ca/_media/emacs/prolog.el";
-    sha256 = "ZzIDFQWPq1vI9z3btgsHgn0axN6uRQn9Tt8TnqGybOk=";
+    hash = "sha256-ZzIDFQWPq1vI9z3btgsHgn0axN6uRQn9Tt8TnqGybOk=";
   };
 
+  postPatch = ''
+    substituteInPlace prolog.el \
+      --replace-fail ";; prolog.el ---" ";;; prolog.el ---"
+  '';
+
   meta = {
     homepage = "https://bruda.ca/emacs/prolog_mode_for_emacs/";
     description = "Prolog mode for Emacs";