diff --git a/ext/odoo/addons/website/models/ir_qweb.py b/ext/odoo/addons/website/models/ir_qweb.py
index a0d87e24..92a3f6e2 100644
--- a/ext/odoo/addons/website/models/ir_qweb.py
+++ b/ext/odoo/addons/website/models/ir_qweb.py
@@ -3,7 +3,7 @@
 
 import ast
 
-from odoo import models
+from odoo import models, tools
 from odoo.http import request
 
 
@@ -23,7 +23,14 @@ class QWeb(models.AbstractModel):
         'img':     'src',
     }
 
-    def _get_asset(self, xmlid, options, css=True, js=True, debug=False, async_load=False, values=None):
+    # compatibility to remove after v11 - DEPRECATED
+    @tools.conditional(
+        'xml' not in tools.config['dev_mode'],
+        tools.ormcache_context('xmlid', 'options.get("lang", "en_US")', 'css', 'js', 'debug', 'kw.get("async")', 'async_load', keys=("website_id",)),
+    )
+    def _get_asset(self, xmlid, options, css=True, js=True, debug=False, async_load=False, values=None, **kw):
+        if 'async' in kw:
+            async_load = kw['async']
         website = getattr(request, 'website', None) if request else None
         if website and website.cdn_activated:
             values = dict(values or {}, url_for=website.get_cdn_url)