diff --git a/src/MartinGeorgiev/Doctrine/DBAL/Types/BaseType.php b/src/MartinGeorgiev/Doctrine/DBAL/Types/BaseType.php
index a4d0e644..aae1181f 100644
--- a/src/MartinGeorgiev/Doctrine/DBAL/Types/BaseType.php
+++ b/src/MartinGeorgiev/Doctrine/DBAL/Types/BaseType.php
@@ -25,7 +25,7 @@ public function getSQLDeclaration(array $fieldDeclaration, AbstractPlatform $pla
     {
         $this->throwExceptionIfTypeNameNotConfigured();
 
-        return $platform->getDoctrineTypeMapping(static::TYPE_NAME);
+        return \strtoupper($platform->getDoctrineTypeMapping(static::TYPE_NAME));
     }
 
     public function getName(): string