diff --git a/core/boot b/core/boot
index 86ace8c..643030b 100755
--- a/core/boot
+++ b/core/boot
@@ -12,7 +12,7 @@ cp /mail_settings/aliases /etc/postfix/virtual
 cp /mail_settings/domains /etc/postfix/virtual-mailbox-domains
 
 # Parse mailbox settings
-mkdir /etc/postfix/tmp
+mkdir -p /etc/postfix/tmp
 awk < /etc/postfix/virtual '{ print $2 }' > /etc/postfix/tmp/virtual-receivers
 sed -r 's,(.+)@(.+),\2/\1/,' /etc/postfix/tmp/virtual-receivers > /etc/postfix/tmp/virtual-receiver-folders
 paste /etc/postfix/tmp/virtual-receivers /etc/postfix/tmp/virtual-receiver-folders > /etc/postfix/virtual-mailbox-maps