--- a/ipkg-buildpackage
+++ b/ipkg-buildpackage
@@ -190,7 +190,7 @@ fi
 mkdir /tmp/${pkg}/CONTROL
 
 files_required="control"
-files_optional="preinst postinst prerm postrm"
+files_optional="preinst postinst prerm postrm conffiles"
 
 for i in ${files_required} ; do
 	file=${CONTROL}/$i
