diff --git a/docs/Makefile.am b/docs/Makefile.am
index a5e62fb59..ee3d0e3f2 100644
--- a/docs/Makefile.am
+++ b/docs/Makefile.am
@@ -19,6 +19,8 @@ PDFPAGES = \
 
 SUBDIRS = examples libcurl
 
+CLEANFILES = $(HTMLPAGES) $(PDFPAGES)
+
 EXTRA_DIST = MANUAL BUGS CONTRIBUTE FAQ FEATURES INTERNALS SSLCERTS	\
 	     README.win32 RESOURCES TODO TheArtOfHttpScripting THANKS	\
 	     VERSIONS KNOWN_BUGS BINDINGS $(man_MANS) $(HTMLPAGES) \