diff --git a/bash/hetzner-rescue.sh b/bash/hetzner-rescue.sh
index 47d3a73..16b5410 100644
--- a/bash/hetzner-rescue.sh
+++ b/bash/hetzner-rescue.sh
@@ -254,7 +254,7 @@ function hetzner-rescue-wipe-8-8-0 {
     | cryptsetup luksOpen '/dev/md/crypt' 'crypt'
     # wipe crypt
     dd status='progress' \
-    if='/dev/zero' of='/dev/mapper/crypt' bs='16G'
+    if='/dev/zero' of='/dev/mapper/crypt' bs='8G'
 }
 
 function hetzner-rescue-wipe-8-8-1 {