diff --git a/frappe/core/doctype/communication/patches/__init__.py b/frappe/core/doctype/communication/patches/__init__.py
new file mode 100644
index 0000000000..e69de29bb2
diff --git a/frappe/core/doctype/communication/patches/drop_ref_dt_dn_index.py b/frappe/core/doctype/communication/patches/drop_ref_dt_dn_index.py
new file mode 100644
index 0000000000..c1c3fa995b
--- /dev/null
+++ b/frappe/core/doctype/communication/patches/drop_ref_dt_dn_index.py
@@ -0,0 +1,8 @@
+import frappe
+from frappe.patches.v14_0.drop_unused_indexes import drop_index_if_exists
+
+
+def execute():
+	index_fields = ["reference_doctype", "reference_name"]
+	index_name = frappe.db.get_index_name(index_fields)
+	drop_index_if_exists("tabCommunication", index_name)
diff --git a/frappe/patches.txt b/frappe/patches.txt
index 8113d8db1a..5b076fab59 100644
--- a/frappe/patches.txt
+++ b/frappe/patches.txt
@@ -251,3 +251,4 @@ frappe.patches.v16_0.add_module_deprecation_warning
 frappe.patches.v16_0.auto_generate_desktop_icon_and_sidebar
 frappe.patches.v16_0.add_private_workspaces_to_sidebar
 frappe.core.doctype.communication_link.patches.copy_communication_date_to_link
+frappe.core.doctype.communication.patches.drop_ref_dt_dn_index