diff --git a/document_url/__manifest__.py b/document_url/__manifest__.py
index 6f81feed..0900b1e8 100644
--- a/document_url/__manifest__.py
+++ b/document_url/__manifest__.py
@@ -2,7 +2,7 @@
 # Copyright 2020 Tecnativa - Manuel Calero
 {
     "name": "URL attachment",
-    "version": "15.0.1.0.0",
+    "version": "16.0.1.0.0",
     "category": "Tools",
     "author": "Tecnativa, Odoo Community Association (OCA)",
     "website": "https://github.com/OCA/knowledge",
diff --git a/document_url/migrations/14.0.1.0.0/post-migration.py b/document_url/migrations/14.0.1.0.0/post-migration.py
deleted file mode 100644
index 58a70619..00000000
--- a/document_url/migrations/14.0.1.0.0/post-migration.py
+++ /dev/null
@@ -1,16 +0,0 @@
-# Copyright 2021 Tecnativa - Víctor Martínez
-# License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl.html).
-
-from openupgradelib import openupgrade
-
-
-@openupgrade.migrate()
-def migrate(env, version):
-    openupgrade.logged_query(
-        env.cr,
-        """
-        UPDATE ir_attachment
-        SET mimetype = 'application/link'
-        WHERE type = 'link'
-        """,
-    )
diff --git a/document_url/tests/test_document_url.py b/document_url/tests/test_document_url.py
index 47c7122a..56511345 100644
--- a/document_url/tests/test_document_url.py
+++ b/document_url/tests/test_document_url.py
@@ -1,5 +1,7 @@
 # License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl.html).
 
+import base64
+
 from odoo.tests import common
 
 
@@ -27,3 +29,11 @@ class TestDocumentUrl(common.TransactionCase):
         self.assertEqual(attachment_added_count, 1)
         attachment = self.env["ir.attachment"].search(domain)
         self.assertEqual(attachment.mimetype, "application/link")
+
+    def test_dont_broke_default_compute_mimetype(self):
+        blob1 = b"blob1"
+        blob1_b64 = base64.b64encode(blob1)
+        attachment = self.env["ir.attachment"].create(
+            {"name": "a2", "datas": blob1_b64, "mimetype": "image/png"}
+        )
+        self.assertEqual(attachment.mimetype, "image/png")