diff --git a/pkgs/tools/networking/babeld/default.nix b/pkgs/tools/networking/babeld/default.nix
index 60b79220628..12d2d169a23 100644
--- a/pkgs/tools/networking/babeld/default.nix
+++ b/pkgs/tools/networking/babeld/default.nix
@@ -1,10 +1,11 @@
 { stdenv, fetchurl }:
 
 stdenv.mkDerivation rec {
-  name = "babeld-1.9.1";
+  pname = "babeld";
+  version = "1.9.1";
 
   src = fetchurl {
-    url = "http://www.pps.univ-paris-diderot.fr/~jch/software/files/${name}.tar.gz";
+    url = "http://www.pps.univ-paris-diderot.fr/~jch/software/files/${pname}-${version}.tar.gz";
     sha256 = "1d503igqv9s5pgrhvxp1czjy2xfsjhagyyh2iny7g4cjvl0kq6qy";
   };