diff --git a/pkgs/applications/networking/remote/putty/default.nix b/pkgs/applications/networking/remote/putty/default.nix
index 747413400b39..980bb894aa2a 100644
--- a/pkgs/applications/networking/remote/putty/default.nix
+++ b/pkgs/applications/networking/remote/putty/default.nix
@@ -1,7 +1,10 @@
 { stdenv, fetchsvn, ncurses, gtk, pkgconfig, autoconf, automake, perl, halibut }:
  
+let
+  rev = 8934;
+in
 stdenv.mkDerivation {
-  name = "putty-r8934";
+  name = "putty-${toString rev}";
   # builder = ./builder.sh;
 
   preConfigure = ''
@@ -17,7 +20,7 @@ stdenv.mkDerivation {
   # I don't know of any better URL
   src = fetchsvn {
     url = svn://svn.tartarus.org/sgt/putty;
-    rev = 8934;
+    rev = rev;
     sha256 = "1yg5jhk7jp4yrnhpi0lvz71qqaf5gfpcwy8p198qqs8xgd1w51jc";
   };