diff --git a/pystreamapi/_streams/error/__sentinel.py b/pystreamapi/_streams/error/__sentinel.py
index c38a464..10eeea6 100644
--- a/pystreamapi/_streams/error/__sentinel.py
+++ b/pystreamapi/_streams/error/__sentinel.py
@@ -8,4 +8,4 @@ def __ne__(self, other):
         return not isinstance(other, Sentinel)
 
     def __hash__(self):
-        return hash(Sentinel)
\ No newline at end of file
+        return hash(Sentinel)