diff --git a/pkgs/applications/editors/emacs-24/builder.sh b/pkgs/applications/editors/emacs-24/builder.sh
index d04e7a4fdd3..c472d2b1a64 100644
--- a/pkgs/applications/editors/emacs-24/builder.sh
+++ b/pkgs/applications/editors/emacs-24/builder.sh
@@ -29,6 +29,4 @@ preConfigure() {
     done
 }
 
-preBuild="make bootstrap"
-
 genericBuild
diff --git a/pkgs/applications/editors/emacs-24/default.nix b/pkgs/applications/editors/emacs-24/default.nix
index 82238a55d1c..a781cb37346 100644
--- a/pkgs/applications/editors/emacs-24/default.nix
+++ b/pkgs/applications/editors/emacs-24/default.nix
@@ -9,13 +9,13 @@ assert (libXft != null) -> libpng != null;	# probably a bug
 assert stdenv.isDarwin -> libXaw != null;	# fails to link otherwise
 
 stdenv.mkDerivation rec {
-  name = "emacs-24.2";
+  name = "emacs-24.3";
 
   builder = ./builder.sh;
 
   src = fetchurl {
-    url = "mirror://gnu/emacs/${name}.tar.bz2";
-    sha256 = "13wbjfjmz13qpjwssy44nw2230lllmkkgjsy0rqfm6am2cf87n3k";
+    url = "mirror://gnu/emacs/${name}.tar.xz";
+    sha256 = "1385qzs3bsa52s5rcncbrkxlydkw0ajzrvfxgv8rws5fx512kakh";
   };
 
   buildInputs =