diff --git a/Lib/idlelib/OutputWindow.py b/Lib/idlelib/OutputWindow.py
index 7991e18..ef155a4 100644
--- a/Lib/idlelib/OutputWindow.py
+++ b/Lib/idlelib/OutputWindow.py
@@ -47,8 +47,9 @@
         self.text.see(mark)
         self.text.update()
 
-    def writelines(self, l):
-        map(self.write, l)
+    def writelines(self, lines):
+        for line in lines:
+            self.write(line)
 
     def flush(self):
         pass