diff --git a/index.cds b/index.cds
index 05888092..77169e18 100644
--- a/index.cds
+++ b/index.cds
@@ -42,5 +42,4 @@ annotate Attachments with @UI:{
 } {
   content
     @Core.ContentDisposition: { Filename: filename, Type: 'inline' }
-    @Core.Immutable
 }