diff --git a/erpnext/projects/doctype/project/project.py b/erpnext/projects/doctype/project/project.py
index b0cda8df8f8..0e9e9d11dae 100644
--- a/erpnext/projects/doctype/project/project.py
+++ b/erpnext/projects/doctype/project/project.py
@@ -590,7 +590,7 @@ def allow_to_make_project_update(project, time, frequency):
 
 
 @frappe.whitelist()
-def create_duplicate_project(prev_doc, project_name):
+def create_duplicate_project(prev_doc: str | dict, project_name: str):
 	"""Create duplicate project based on the old project"""
 	import json