diff --git a/pkgs/tools/security/mbox/default.nix b/pkgs/tools/security/mbox/default.nix
index d7a303a3672f..a39d226aac57 100644
--- a/pkgs/tools/security/mbox/default.nix
+++ b/pkgs/tools/security/mbox/default.nix
@@ -2,7 +2,7 @@
 
 stdenv.mkDerivation {
   pname = "mbox";
-  version = "20140526";
+  version = "unstable-2014-05-26";
 
   src = fetchFromGitHub {
     owner = "tsgates";
@@ -28,13 +28,12 @@ stdenv.mkDerivation {
     ./testall.sh
   '';
 
-  meta = with lib;
-    { description = "Lightweight sandboxing mechanism that any user can use without special privileges";
-      homepage = "http://pdos.csail.mit.edu/mbox/";
-      maintainers = with maintainers; [ ehmry ];
-      license = licenses.bsd3;
-      platforms = [ "x86_64-linux" ];
-      broken = true;
-    };
-
+  meta = with lib;    {
+    description = "Lightweight sandboxing mechanism that any user can use without special privileges";
+    homepage = "http://pdos.csail.mit.edu/mbox/";
+    maintainers = with maintainers; [ ehmry ];
+    license = licenses.bsd3;
+    platforms = [ "x86_64-linux" ];
+    broken = true;
+  };
 }