diff --git a/src/drf_yasg/generators.py b/src/drf_yasg/generators.py
index 4e203a2d..66c8e97c 100644
--- a/src/drf_yasg/generators.py
+++ b/src/drf_yasg/generators.py
@@ -195,6 +195,8 @@ def __init__(self, info, version='', url=None, patterns=None, urlconf=None):
                 raise SwaggerGenerationError("`url` must be an absolute HTTP(S) url")
             if parsed_url.path:
                 logger.warning("path component of api base URL %s is ignored; use FORCE_SCRIPT_NAME instead" % url)
+            else:
+                self._gen.url = url
 
     @property
     def url(self):