diff --git a/storages/backends/s3boto3.py b/storages/backends/s3boto3.py
index 338052dbe..3e487d17e 100644
--- a/storages/backends/s3boto3.py
+++ b/storages/backends/s3boto3.py
@@ -573,6 +573,19 @@ def url(self, name, parameters=None, expire=None, http_method=None):
         params['Key'] = name
         url = self.bucket.meta.client.generate_presigned_url('get_object', Params=params,
                                                              ExpiresIn=expire, HttpMethod=http_method)
+
+        if self.custom_domain:
+            # Key parameter can't be empty. Use "/" and remove it later.
+            params['Key'] = '/'
+            root_url_signed = self.bucket.meta.client.generate_presigned_url('get_object',
+                                                                             Params=params,
+                                                                             ExpiresIn=expire)
+            # Remove signing parameter and previouly added key "/".
+            root_url = self._strip_signing_parameters(root_url_signed)[:-1]
+            # Replace bucket domain with custom domain.
+            custom_url = "{}//{}/".format(self.url_protocol, self.custom_domain)
+            url = url.replace(root_url, custom_url)
+
         if self.querystring_auth:
             return url
         return self._strip_signing_parameters(url)