diff --git a/Lib/io.py b/Lib/io.py
index 7f93898..320a4b9 100644
--- a/Lib/io.py
+++ b/Lib/io.py
@@ -1167,7 +1167,7 @@
 
     @property
     def closed(self):
-        return self.writer.closed()
+        return self.writer.closed
 
 
 class BufferedRandom(BufferedWriter, BufferedReader):