diff --git a/frappe/core/doctype/data_import/data_import.py b/frappe/core/doctype/data_import/data_import.py
index cfecb3fbdaa..b2de0badc99 100644
--- a/frappe/core/doctype/data_import/data_import.py
+++ b/frappe/core/doctype/data_import/data_import.py
@@ -138,7 +138,7 @@ def get_preview_from_template(data_import, import_file=None, google_sheets_url=N
 
 
 @frappe.whitelist()
-def form_start_import(data_import):
+def form_start_import(data_import: str):
 	return frappe.get_doc("Data Import", data_import).start_import()