diff --git a/database/mysql/mode/databasessize.pm b/database/mysql/mode/databasessize.pm
index b218222c7..50fad0583 100644
--- a/database/mysql/mode/databasessize.pm
+++ b/database/mysql/mode/databasessize.pm
@@ -61,7 +61,7 @@ sub check_options {
     $self->SUPER::init(%options);
 
     if (($self->{perfdata}->threshold_validate(label => 'warning', value => $self->{option_results}->{warning})) == 0) {
-       $self->{output}->add_option_msg(short_msg => "Wrong warning threshold '" . $self->{option_results}->{warning})) . "'.");
+       $self->{output}->add_option_msg(short_msg => "Wrong warning threshold '" . $self->{option_results}->{warning} . "'.");
        $self->{output}->option_exit();
     }
     if (($self->{perfdata}->threshold_validate(label => 'critical', value => $self->{option_results}->{critical})) == 0) {