diff --git a/frappe/model/delete_doc.py b/frappe/model/delete_doc.py
index af67350ab6..b518db0a28 100644
--- a/frappe/model/delete_doc.py
+++ b/frappe/model/delete_doc.py
@@ -333,7 +333,7 @@ def clear_references(doctype, reference_doctype, reference_name,
 
 def clear_timeline_references(link_doctype, link_name):
 	frappe.db.sql("""delete from `tabCommunication Link`
-		where `tabCommunication Link`.link_doctype='{0}' and `tabCommunication Link`.link_name='{1}'""".format(link_doctype, link_name)) # nosec
+		where `tabCommunication Link`.link_doctype='{0}' and `tabCommunication Link`.link_name=%s""".format(link_doctype), (link_name)) # nosec
 
 def insert_feed(doc):
 	from frappe.utils import get_fullname