diff --git a/src/RequestData.php b/src/RequestData.php
index 0ab0948..88ec228 100644
--- a/src/RequestData.php
+++ b/src/RequestData.php
@@ -53,7 +53,7 @@ public function ensureAttributes(array &$attributes)
             $attributes['IsUnicode'] = $attributes['IsUnicode'] ?? 1;
             $attributes['Sandbox'] = $attributes['IsUnicode'] ?? 0;
 
-            if ($attributes['SmsType'] === 1 or $attributes['SmsType'] === 2) {
+            if ($attributes['SmsType'] === 1 || $attributes['SmsType'] === 2) {
                 $this->addRule(['Brandname'], 'required');
             }
         }