diff --git a/Makefile.am b/Makefile.am
index 62eb42e..8f6c433 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -12,7 +12,8 @@ vk.hpp: vk.xml vk.xsl
 	$(XSLTPROC) $(XSLTFLAGS) -o $(builddir)/$@ $(srcdir)/vk.xsl $(srcdir)/vk.xml
 
 EXTRA_DIST = vk.xml vk.xsl
-#BUILT_SOURCES = vk.hpp
+BUILT_SOURCES = vk.hpp
+CLEANFILES = $(BUILT_SOURCES)
 
 libcruft_vk_a_SOURCES = \
     vk.hpp		\