diff --git a/pynvim/api/buffer.py b/pynvim/api/buffer.py
index a9920545..c165f348 100644
--- a/pynvim/api/buffer.py
+++ b/pynvim/api/buffer.py
@@ -3,7 +3,7 @@
 from pynvim.compat import IS_PYTHON3, check_async
 
 
-__all__ = ('Buffer')
+__all__ = ['Buffer']
 
 
 if IS_PYTHON3: