diff --git a/dash/dash.py b/dash/dash.py
index fb14dbee03..715a794ea1 100644
--- a/dash/dash.py
+++ b/dash/dash.py
@@ -327,9 +327,13 @@ def _relative_url_path(relative_package_path='', namespace=''):
                     'Serving files from absolute_path isn\'t supported yet'
                 )
             elif 'asset_path' in resource:
-                static_url = flask.url_for('assets.static',
-                                           filename=resource['asset_path'],
-                                           mod=resource['ts'])
+                static_url = '/'.join([
+                    # Only take the first part of the pathname
+                    self.config.requests_pathname_prefix.rstrip(
+                        self.config.routes_pathname_prefix),
+                    'assets',
+                    resource['asset_path']
+                ]) + '?m={}'.format(resource['ts'])
                 srcs.append(static_url)
         return srcs