diff --git a/install_postfix_advanced.sh b/install_postfix_advanced.sh
index fc4f5fb..009625e 100755
--- a/install_postfix_advanced.sh
+++ b/install_postfix_advanced.sh
@@ -1312,7 +1312,7 @@ else
    echo_failed
 fi
 
-if ! $_IS_RELAY_HOST ; then
+if ! $IS_RELAY_HOST ; then
    ## - Create Directory '/var/vmail' for virtual mailboxes
    ## -
    echononl "   Create directory '/var/vmail'"