diff --git a/frappe/patches.txt b/frappe/patches.txt
index a678367b90..a23f61b899 100644
--- a/frappe/patches.txt
+++ b/frappe/patches.txt
@@ -48,3 +48,4 @@ execute:frappe.db.sql("""update `tabSingles` set `value`=`doctype` where `field`
 frappe.patches.v4_1.enable_print_as_pdf #2014-06-17
 execute:frappe.db.sql("""update `tabDocPerm` set email=1 where parent='User' and permlevel=0 and `role`='All' and `read`=1 and apply_user_permissions=1""") #2014-07-15
 execute:frappe.db.sql("""update `tabPrint Format` set print_format_type='Client' where ifnull(print_format_type, '')=''""") #2014-07-28
+frappe.patches.v4_1.file_manager_fix
diff --git a/frappe/patches/v4_1/file_manager_fix.py b/frappe/patches/v4_1/file_manager_fix.py
new file mode 100644
index 0000000000..8831af94bb
--- /dev/null
+++ b/frappe/patches/v4_1/file_manager_fix.py
@@ -0,0 +1,31 @@
+# Copyright (c) 2013, Web Notes Technologies Pvt. Ltd. and Contributors
+# MIT License. See license.txt
+
+from __future__ import unicode_literals
+
+import frappe
+import os
+from frappe.utils import get_files_path
+from frappe.utils.file_manager import get_content_hash, get_file
+
+
+def execute():
+	for name, file_name, file_url in frappe.db.sql(
+			"""select name, file_name, file_url from `tabFile Data`
+			where file_name is not null and content_hash is null"""):
+		b = frappe.get_doc('File Data', name)
+		old_file_name = b.file_name
+		b.file_name = os.path.basename(old_file_name)
+		if old_file_name.startswith('files/') or old_file_name.startswith('/files/'):
+			b.file_url = os.path.normpath('/' + old_file_name)
+		else:
+			b.file_url = os.path.normpath('/files/' + old_file_name)
+		try:
+			_file_name, content = get_file(name)
+			b.content_hash = get_content_hash(content)
+		except IOError:
+			print 'Warning: Error processing ', name
+			_file_name = old_file_name
+			b.content_hash = None
+
+		b.save()