diff --git a/pkgs/tools/security/mktemp/builder.sh b/pkgs/tools/security/mktemp/builder.sh
deleted file mode 100644
index 896ef426398..00000000000
--- a/pkgs/tools/security/mktemp/builder.sh
+++ /dev/null
@@ -1,3 +0,0 @@
-source $stdenv/setup
- 
-genericBuild
diff --git a/pkgs/tools/security/mktemp/default.nix b/pkgs/tools/security/mktemp/default.nix
index e73f38d5dbc..2b4483479f9 100644
--- a/pkgs/tools/security/mktemp/default.nix
+++ b/pkgs/tools/security/mktemp/default.nix
@@ -3,7 +3,6 @@
 stdenv.mkDerivation {
   name = "mktemp-1.5";
   
-  builder = ./builder.sh;
   src = fetchurl {
     url = http://nix.cs.uu.nl/dist/tarballs/mktemp-1.5.tar.gz;
     md5 = "9a35c59502a228c6ce2be025fc6e3ff2";