diff --git a/doc/tutorial/tutorial_phylogeny.rst b/doc/tutorial/tutorial_phylogeny.rst
index 8ece7e4d9..9cd307ad8 100644
--- a/doc/tutorial/tutorial_phylogeny.rst
+++ b/doc/tutorial/tutorial_phylogeny.rst
@@ -265,8 +265,6 @@ You can find a comparison of both methods in
 `Marcet-Houben and Gabaldon (2009) <http://www.plosone.org/article/info:doi%2F10.1371%2Fjournal.pone.0004357>`_.
 
 
-.. _spoverlap:
-
 Species Overlap (SO) algorithm
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~