diff --git a/setup.py b/setup.py
index b7e8ab6a..aa9b1c89 100644
--- a/setup.py
+++ b/setup.py
@@ -16,7 +16,7 @@ setup(
     long_description_content_type='text/markdown',
     install_requires=['aiocqhttp>=0.6', 'aiocache>=0.10'],
     extras_require={
-        'Scheduler': ['apscheduler>=1.2'],
+        'scheduler': ['apscheduler>=1.2'],
     },
     python_requires='>=3.6',
     platforms='any',