diff --git a/src/Database/Traits/Validation.php b/src/Database/Traits/Validation.php
index 80830b839..cdc68ecb8 100644
--- a/src/Database/Traits/Validation.php
+++ b/src/Database/Traits/Validation.php
@@ -517,7 +517,7 @@ protected function processRuleFieldNames($rules)
     protected function processValidationUniqueRule($definition, $fieldName)
     {
         if (!$this->exists) {
-            if ($definition === 'unique') {
+            if ($definition === 'unique' || $definition === 'unique_site') {
                 return $definition . ':' . $this->getTable();
             }
             return $definition;