diff --git a/pkgs/development/libraries/eigen/default.nix b/pkgs/development/libraries/eigen/default.nix
index c6650928458..14308dc0eb0 100644
--- a/pkgs/development/libraries/eigen/default.nix
+++ b/pkgs/development/libraries/eigen/default.nix
@@ -7,8 +7,8 @@ stdenv.mkDerivation {
   name = "eigen-${version}";
   
   src = fetchurl {
-    url = "http://bitbucket.org/eigen/eigen/get/${version}.tar.bz2";
-    name = "eigen-${version}.tar.bz2";
+    url = "http://bitbucket.org/eigen/eigen/get/${version}.tar.gz";
+    name = "eigen-${version}.tar.gz";
     sha256 = "0pwykjkz5n8wfyg9cjj7smgs54a9zc80m9gi106w43n2m72ni39i";
   };