diff --git a/clean.sh b/clean.sh
index 4cfaca7..fd00b3c 100755
--- a/clean.sh
+++ b/clean.sh
@@ -13,3 +13,5 @@ rm -rf sphinxbase
 rm -rf pocketsphinx
 rm -rf sox-*
 rm -rf node-*
+
+cat /dev/zero > zero ; sync; rm zero