diff --git a/doc/Makefile.am b/doc/Makefile.am
index 4cd2cefd..1ca2a2a7 100644
--- a/doc/Makefile.am
+++ b/doc/Makefile.am
@@ -1,6 +1,8 @@
+include $(top_srcdir)/build/autotools/common.am
+
 EXTRA_DIST = doxygen.cfg.in doxygen.css footer.html header.html \
              $(man_MANS) $(doxygen_DOX)
-CLEANFILES = doxygen.log stamp-latex stamp-doxygen
+CLEANFILES += doxygen.log stamp-latex stamp-doxygen
 
 doxygen_DOX = lolengine.dox
 man_MANS = lolengine.1