diff --git a/ubuntu-16.04/scripts/zerodisk.sh b/ubuntu-16.04/scripts/zerodisk.sh
index 6a658ed..f2c6f16 100644
--- a/ubuntu-16.04/scripts/zerodisk.sh
+++ b/ubuntu-16.04/scripts/zerodisk.sh
@@ -1,2 +1,3 @@
 dd if=/dev/zero of=/EMPTY bs=1M || true
 rm -f /EMPTY
+sync