diff --git a/pkgs/build-support/emacs/melpa.nix b/pkgs/build-support/emacs/melpa.nix
index 85bc8aa37b3aa..a882145c3f3d7 100644
--- a/pkgs/build-support/emacs/melpa.nix
+++ b/pkgs/build-support/emacs/melpa.nix
@@ -40,12 +40,10 @@ import ./generic.nix { inherit lib stdenv emacs texinfo writeText gcc; } ({
     src = fetchFromGitHub {
       owner = "melpa";
       repo = "package-build";
-      rev = "c3c535e93d9dc92acd21ebc4b15016b5c3b90e7d";
-      sha256 = "17z0wbqdd6fspbj43yq8biff6wfggk74xgnaf1xx6ynsp1i74is5";
+      rev = "c48aa078c01b4f07b804270c4583a0a58ffea1c0";
+      sha256 = "sha256-MzPj375upIiYXdQR+wWXv3A1zMqbSrZlH0taLuxx/1M=";
     };
 
-    patches = [ ./package-build-dont-use-mtime.patch ];
-
     dontConfigure = true;
     dontBuild = true;
 
diff --git a/pkgs/build-support/emacs/melpa2nix.el b/pkgs/build-support/emacs/melpa2nix.el
index 72667dea652c1..6064b0edc4eaa 100644
--- a/pkgs/build-support/emacs/melpa2nix.el
+++ b/pkgs/build-support/emacs/melpa2nix.el
@@ -12,17 +12,12 @@
 (setq large-file-warning-threshold nil)
 
 (defun melpa2nix-build-package-1 (rcp version commit)
-  (let ((source-dir (package-recipe--working-tree rcp)))
-    (unwind-protect
-        (let ((files (package-build-expand-files-spec rcp t)))
-          (cond
-           ((= (length files) 1)
-            (package-build--build-single-file-package
-             rcp version commit files source-dir))
-           ((> (length files) 1)
-            (package-build--build-multi-file-package
-             rcp version commit files source-dir))
-           (t (error "Unable to find files matching recipe patterns")))))))
+  (oset rcp version version)
+  (oset rcp commit commit)
+  (oset rcp time 0)
+  (let ((package-build-checkout-function #'ignore)
+        (package-build-cleanup-function #'ignore))
+    (package-build--package rcp)))
 
 (defun melpa2nix-build-package ()
   (if (not noninteractive)
diff --git a/pkgs/build-support/emacs/package-build-dont-use-mtime.patch b/pkgs/build-support/emacs/package-build-dont-use-mtime.patch
deleted file mode 100644
index fe94de57a3002..0000000000000
--- a/pkgs/build-support/emacs/package-build-dont-use-mtime.patch
+++ /dev/null
@@ -1,40 +0,0 @@
-diff --git a/package-build.el b/package-build.el
-index e572045..9eb0f82 100644
---- a/package-build.el
-+++ b/package-build.el
-@@ -415,7 +415,7 @@ (defun package-build--write-pkg-file (desc dir)
-       (princ ";; Local Variables:\n;; no-byte-compile: t\n;; End:\n"
-              (current-buffer)))))
- 
--(defun package-build--create-tar (name version directory mtime)
-+(defun package-build--create-tar (name version directory)
-   "Create a tar file containing the contents of VERSION of package NAME.
- DIRECTORY is a temporary directory that contains the directory
- that is put in the tarball.  MTIME is used as the modification
-@@ -434,7 +434,7 @@ (defun package-build--create-tar (name version directory mtime)
-        ;; prevent a reproducable tarball as described at
-        ;; https://reproducible-builds.org/docs/archives.
-        "--sort=name"
--       (format "--mtime=@%d" mtime)
-+       "--mtime=@0"
-        "--owner=0" "--group=0" "--numeric-owner"
-        "--pax-option=exthdr.name=%d/PaxHeaders/%f,delete=atime,delete=ctime"))
-     (when (and package-build-verbose noninteractive)
-@@ -848,12 +848,11 @@ (defun package-build--build-multi-file-package (rcp version commit files source-
-                            (package-build--desc-from-library
-                             name version commit files 'tar)
-                            (error "%s[-pkg].el matching package name is missing"
--                                  name))))
--               (mtime (package-build--get-commit-time rcp commit)))
-+                                  name)))))
-           (package-build--copy-package-files files source-dir target)
-           (package-build--write-pkg-file desc target)
-           (package-build--generate-info-files files source-dir target)
--          (package-build--create-tar name version tmp-dir mtime)
-+          (package-build--create-tar name version tmp-dir)
-           (package-build--write-pkg-readme name files source-dir)
-           (package-build--write-archive-entry desc))
-       (delete-directory tmp-dir t nil))))
--- 
-2.37.2
-