diff --git a/pkgs/development/libraries/eigen/2.0.nix b/pkgs/development/libraries/eigen/2.0.nix
index 6317dfe5887..4ea9f068d39 100644
--- a/pkgs/development/libraries/eigen/2.0.nix
+++ b/pkgs/development/libraries/eigen/2.0.nix
@@ -19,5 +19,6 @@ stdenv.mkDerivation {
     license = licenses.lgpl3Plus;
     homepage = http://eigen.tuxfamily.org ;
     maintainers = with stdenv.lib.maintainers; [ sander urkud raskin ];
+    branch = "2";
   };
 }