diff --git a/flask_apispec/apidoc.py b/flask_apispec/apidoc.py
index 7a44f6a..a93b085 100644
--- a/flask_apispec/apidoc.py
+++ b/flask_apispec/apidoc.py
@@ -21,7 +21,7 @@ def __init__(self, app):
self.app = app
def convert(self, target, endpoint=None, blueprint=None, **kwargs):
- endpoint = endpoint or target.__name__.lower()
+ endpoint = endpoint or target.__name__
if blueprint:
endpoint = '{}.{}'.format(blueprint, endpoint)
rules = self.app.url_map._rules_by_endpoint[endpoint]