diff --git a/doc/doxygen/Makefile.am b/doc/doxygen/Makefile.am
index 6dc30c085f87acbfa632aa06bf0a272c4f61fb09..54c9725a6af96d545c8251b2c3a5005b31859919 100644
--- a/doc/doxygen/Makefile.am
+++ b/doc/doxygen/Makefile.am
@@ -3,7 +3,6 @@ BASEDIR=../..
 CURDIR=doc/doxygen
 WHAT=
 
-doxygendir = $(datadir)/doc/dune-tnnmg/doxygen
 doxygen_DATA = $(WHAT)
 
 #we need this in the distribution