diff --git a/etc/vmail.conf b/etc/vmail.conf
index 4591661..838ec0d 100644
--- a/etc/vmail.conf
+++ b/etc/vmail.conf
@@ -2,7 +2,7 @@
 
 # any script that includes this conf file will force user to be vmail
 if [ "$USER" != "vmail" ]; then
-  exec su --shell /bin/bash "vmail" "$0" -- "$@"
+  exec sudo -u vmail $0 $@
 fi
 
 # constants