diff --git a/doc/doxygen/Makefile.am b/doc/doxygen/Makefile.am
index fe54b21cabee2b57a2883f458c5ae50ffb563204..656e5fede60b9404a7b1895a3fef1ebf0b844840 100644
--- a/doc/doxygen/Makefile.am
+++ b/doc/doxygen/Makefile.am
@@ -11,7 +11,7 @@ CURDIR=doc/doxygen
 EXTRAINSTALL = html/*.html html/*.css html/*.png doxygen.log
 
 # what files does the doxygen-generated stuff depend on (find-syntax)
-DEPENDON = -name \*.cc -o -name \*.hh -o -name \*.css -o -name \*.html -o -name \*.png
+DEPENDON = -name \*.cc -o -name \*.hh -o -name \*.png
 
 # check dependency ourself to be robust
 doxygen-tag: FORCE