diff --git a/pkgs/os-specific/linux/mdadm/default.nix b/pkgs/os-specific/linux/mdadm/default.nix
index a3e29ba92a7e6..48e1c17849007 100644
--- a/pkgs/os-specific/linux/mdadm/default.nix
+++ b/pkgs/os-specific/linux/mdadm/default.nix
@@ -22,12 +22,6 @@ stdenv.mkDerivation rec {
       fi
     '';
 
-  preInstall =
-    ''
-    substituteInPlace udev-md-raid-assembly.rules --replace "/sbin/mdadm" "$out/sbin/mdadm"
-    substituteInPlace udev-md-raid-arrays.rules --replace "/sbin/mdadm" "$out/sbin/mdadm"
-    '';
-
   meta = {
     description = "Programs for managing RAID arrays under Linux";
     homepage = http://neil.brown.name/blog/mdadm;