diff --git a/doc/buildsystem.rst b/doc/buildsystem.rst
index b6f3b861a29daabaee4c662e69d60d5fbf0e1420..4e01a700031f053d686d62d0e2e5c8b8a64e18f6 100644
--- a/doc/buildsystem.rst
+++ b/doc/buildsystem.rst
@@ -106,7 +106,7 @@ special targets:
 .. _cmake: http://www.cmake.org/
 .. _python: https://www.python.org/
 .. _boost: http://www.boost.org/
-.. _eigen3: http://eigen.tuxfamily.org/
+.. _eigen3: http://eigen.tuxfamily.org/index.php?title=Main_Page
 .. _lapack: http://www.netlib.org/lapack/
 
 ..  LocalWords:  cmake makefiles CMakeLists txt DOCTEST LINKCHECK conf html