diff --git a/doc/build_draft.sh b/doc/build_draft.sh
index bb8706b19ca164fc1b33b71fdb8872d828746d59..1ce724e9919dc6d6f824256f3136183f7822810f 100755
--- a/doc/build_draft.sh
+++ b/doc/build_draft.sh
@@ -35,7 +35,7 @@ cp -a "${toplevel}"/COPYING "${destdir}"/COPYING
 
 tar czf opus_source.tar.gz "${destdir}"
 echo building base64 version
-cat opus_source.tar.gz| base64 -w 66 | sed 's/^/###/' > opus_source.base64
+cat opus_source.tar.gz| base64 | fold -w 66 | sed 's/^/###/' > opus_source.base64
 
 #echo '<figure>' > opus_compare_escaped.c
 #echo '<artwork>' >> opus_compare_escaped.c