diff --git a/pkgs/applications/editors/emacs/elisp-packages/manual-packages/urweb-mode/default.nix b/pkgs/applications/editors/emacs/elisp-packages/manual-packages/urweb-mode/default.nix
index 6f7e822d81d3..d5b597bdf47b 100644
--- a/pkgs/applications/editors/emacs/elisp-packages/manual-packages/urweb-mode/default.nix
+++ b/pkgs/applications/editors/emacs/elisp-packages/manual-packages/urweb-mode/default.nix
@@ -1,11 +1,12 @@
-{ lib
-, trivialBuild
-, urweb
-, cl-lib
-, flycheck
+{
+  lib,
+  melpaBuild,
+  urweb,
+  cl-lib,
+  flycheck,
 }:
 
-trivialBuild {
+melpaBuild {
   pname = "urweb-mode";
 
   inherit (urweb) src version;
@@ -15,9 +16,9 @@ trivialBuild {
     flycheck
   ];
 
-  postUnpack = ''
-    sourceRoot=$sourceRoot/src/elisp
-  '';
+  files = ''("src/elisp/*.el")'';
+
+  dontConfigure = true;
 
   meta = {
     description = "Major mode for editing Ur/Web";