diff --git a/src/Adapter/Mysql.php b/src/Adapter/Mysql.php
index ff34470..b9a18c5 100644
--- a/src/Adapter/Mysql.php
+++ b/src/Adapter/Mysql.php
@@ -46,7 +46,7 @@ public function getOptions(Config $config)
 
             if (
                 defined('PDO::MYSQL_ATTR_SSL_VERIFY_SERVER_CERT')
-                && isset($config->ssl_do_not_verify_server_cert)
+                && ! empty($config->ssl_do_not_verify_server_cert)
             ) {
                 $options[PDO::MYSQL_ATTR_SSL_VERIFY_SERVER_CERT] = false;
             }