diff --git a/app/config/collections.php b/app/config/collections.php
index bdc14d9105..e872953568 100644
--- a/app/config/collections.php
+++ b/app/config/collections.php
@@ -3256,7 +3256,7 @@ $collections = [
                 '$id' => ID::custom('mimeType'),
                 'type' => Database::VAR_STRING,
                 'format' => '',
-                'size' => 127, // https://tools.ietf.org/html/rfc4288#section-4.2
+                'size' => 255, // https://tools.ietf.org/html/rfc4288#section-4.2
                 'signed' => true,
                 'required' => false,
                 'default' => null,