diff --git a/doc/Makefile.am b/doc/Makefile.am
index e8419de09fd0ce4641044ba6a7f7a7c4635ff3d9..9d70429bfd6b93804d0aadf7f12bdf2670d4366a 100644
--- a/doc/Makefile.am
+++ b/doc/Makefile.am
@@ -14,7 +14,7 @@ MAINTAINERCLEANFILES = *.html *.pdf
 	sed -e 's#@GANETI_VERSION@#$(PACKAGE_VERSION)#g' < $< > $@
 
 %.html: %.sgmltmp
-	docbook2html --nochunks $<
+	docbook2html --nochunks $< || rm -f $@
 
 %.pdf: %.sgmltmp
-	docbook2pdf $<
+	docbook2pdf $< || rm -f $@