diff --git a/src/Grid/Mapper/ColumnMapper.php b/src/Grid/Mapper/ColumnMapper.php
index 54051277..462fead9 100644
--- a/src/Grid/Mapper/ColumnMapper.php
+++ b/src/Grid/Mapper/ColumnMapper.php
@@ -38,6 +38,7 @@
         'published' => 'boolean',
         'classname' => 'string',
         'index' => 'integer',
+        'mimetype' => 'string',
     ];
 
     public function getType(string $column): string
diff --git a/tests/Unit/Grid/Service/SystemColumnServiceTest.php b/tests/Unit/Grid/Service/SystemColumnServiceTest.php
index 86e93439..c4a745fc 100644
--- a/tests/Unit/Grid/Service/SystemColumnServiceTest.php
+++ b/tests/Unit/Grid/Service/SystemColumnServiceTest.php
@@ -39,6 +39,7 @@ public function testGetSystemColumnsForAssets(): void
             'creationDate' => 'datetime',
             'modificationDate' => 'datetime',
             'size' => 'fileSize',
+            'mimetype' => 'string',
         ], $systemColumnService->getSystemColumnsForAssets());
     }