diff --git a/CleanTalkValidator.php b/CleanTalkValidator.php
index cf3b949..fcf720f 100644
--- a/CleanTalkValidator.php
+++ b/CleanTalkValidator.php
@@ -89,7 +89,7 @@ protected function checkValidateConfig(CModel $object)
                 'cleantalk',
                 'Application component "' . $this->apiComponentId . '" is not defined'
             ));
-        } elseif (!in_array($this->check, [self::CHECK_MESSAGE, self::CHECK_USER])) {
+        } elseif (!in_array($this->check, array(self::CHECK_MESSAGE, self::CHECK_USER))) {
             throw new DomainException(Yii::t(
                 'cleantalk',
                 'Validation check property is not defined or invalid'