diff --git a/install_update_dovecot.sh b/install_update_dovecot.sh
index 6606928..a78aa27 100755
--- a/install_update_dovecot.sh
+++ b/install_update_dovecot.sh
@@ -4016,7 +4016,7 @@ EOF
    if [[ "$?" -gt 0 ]]; then
       _failed=true
    fi
-   if !_failed ; then
+   if ! $_failed ; then
       echo -e "$rc_done"
    else
       echo -e "$rc_failed"