diff --git a/app/controllers/attachments_controller.rb b/app/controllers/attachments_controller.rb
index d52f72d3..5dbb4f2b 100644
--- a/app/controllers/attachments_controller.rb
+++ b/app/controllers/attachments_controller.rb
@@ -120,7 +120,7 @@ class AttachmentsController < ApplicationController
     end
     if @attachment.container
       # Make sure association callbacks are called
-      @attachment.container.def attachments.delete(@attachment)
+      @attachment.container.attachments.delete(@attachment)
     else
       @attachment.destroy
     end