diff --git a/src/Database/Type/OptionalConvertInterface.php b/src/Database/Type/OptionalConvertInterface.php
index 1e4bc513aba..f9d6757813a 100644
--- a/src/Database/Type/OptionalConvertInterface.php
+++ b/src/Database/Type/OptionalConvertInterface.php
@@ -25,7 +25,7 @@ interface OptionalConvertInterface
      * Returns whehter the cast to PHP is required to be invoked, since
      * it is not a indentity function.
      *
-     * @return boolean
+     * @return bool
      */
     public function requiresToPHPCast();
 }