diff --git a/doc/Makefile.am b/doc/Makefile.am
index 2997ede98720f9ec02216890b1387cca4f483508..059294308c31ad03dc4789717258101f9c78f0bf 100644
--- a/doc/Makefile.am
+++ b/doc/Makefile.am
@@ -5,9 +5,13 @@ EXTRA_DIST = BuildSystem
 
 SUBDIRS = devel appl doxygen layout
 
-all: index.html
+PAGES = index.html
+
+all: $(PAGES)
 
 # setting like in dune-web
 CURDIR=doc
 
 include $(top_srcdir)/am/webstuff
+
+CLEANFILES = $(PAGES)