diff --git a/DataStorage/Database/Query/Grammar/GrammarInterface.php b/DataStorage/Database/Query/Grammar/GrammarInterface.php
index 234da813f..1624f18bd 100644
--- a/DataStorage/Database/Query/Grammar/GrammarInterface.php
+++ b/DataStorage/Database/Query/Grammar/GrammarInterface.php
@@ -15,6 +15,6 @@ declare(strict_types=1);
 
 namespace phpOMS\DataStorage\Database\Query\Grammar;
 
-class GrammarInterface
+interface GrammarInterface
 {
 }