diff --git a/pkgs/applications/science/math/sage/sagedoc.nix b/pkgs/applications/science/math/sage/sagedoc.nix
index f4a8bf19b69c..d53947d806d1 100644
--- a/pkgs/applications/science/math/sage/sagedoc.nix
+++ b/pkgs/applications/science/math/sage/sagedoc.nix
@@ -76,7 +76,7 @@ stdenv.mkDerivation rec {
     mv html/en/_static{,.tmp}
     for _dir in `find -name _static` ; do
           rm -r $_dir
-          ln -s html/en/_static $_dir
+          ln -rs html/en/_static $_dir
     done
     mv html/en/_static{.tmp,}
   '';