diff --git a/pkgs/servers/silc-server/default.nix b/pkgs/servers/silc-server/default.nix
index ee1aad3b11a6..2afec801961c 100644
--- a/pkgs/servers/silc-server/default.nix
+++ b/pkgs/servers/silc-server/default.nix
@@ -1,10 +1,10 @@
 { stdenv, fetchurl }:
 
-stdenv.mkDerivation {
+stdenv.mkDerivation rec {
   name = "silc-server-1.1.18";
 
   src = fetchurl {
-    url = "http://silcnet.org/download/server/sources/silc-server-1.1.18.tar.bz2";
+    url = "http://silcnet.org/download/server/sources/${name}.tar.bz2";
     sha256 = "0nr0hrwr4kbi611qazmrify7a27nzxb5n7d97f5i9cw3avxlw38s";
   };