diff --git a/frappe/patches/v12_0/setup_comments_from_communications.py b/frappe/patches/v12_0/setup_comments_from_communications.py
index 92256e130e..1a7a5aef84 100644
--- a/frappe/patches/v12_0/setup_comments_from_communications.py
+++ b/frappe/patches/v12_0/setup_comments_from_communications.py
@@ -3,6 +3,8 @@ from __future__ import unicode_literals
 import frappe
 
 def execute():
+    frappe.reload_doctype("Comment")
+
     for comment in frappe.get_all('Communication', fields = ['*'],
         filters = dict(communication_type = 'Comment')):