diff --git a/pkgs/tools/text/wdiff/default.nix b/pkgs/tools/text/wdiff/default.nix
index fd3d4f94769..7ae7241c40b 100644
--- a/pkgs/tools/text/wdiff/default.nix
+++ b/pkgs/tools/text/wdiff/default.nix
@@ -2,9 +2,9 @@
 
 stdenv.mkDerivation rec {
   name = "wdiff-0.6.1";
-  
+
   src = fetchurl {
-    url = "http://alpha.gnu.org/gnu/wdiff/${name}.tar.gz";
+    url = "mirror://gnu/wdiff/${name}.tar.gz";
     sha256 = "0cgmx9k8sj0l79kp4m2lmn4ifx55ah68q4qk7xsanx69m1061ghf";
   };