diff --git a/erpnext/assets/doctype/asset/asset.py b/erpnext/assets/doctype/asset/asset.py
index 984fa97acd2..0c677b804d7 100644
--- a/erpnext/assets/doctype/asset/asset.py
+++ b/erpnext/assets/doctype/asset/asset.py
@@ -1332,7 +1332,7 @@ def has_active_capitalization(asset):
 
 
 @frappe.whitelist()
-def get_values_from_purchase_doc(purchase_doc_name, item_code, doctype):
+def get_values_from_purchase_doc(purchase_doc_name: str, item_code: str, doctype: str):
 	purchase_doc = frappe.get_doc(doctype, purchase_doc_name)
 	matching_items = [item for item in purchase_doc.items if item.item_code == item_code]