diff --git a/mitterlib/ui/ui_zork.py b/mitterlib/ui/ui_zork.py
index 0d447ee..591389f 100644
--- a/mitterlib/ui/ui_zork.py
+++ b/mitterlib/ui/ui_zork.py
@@ -74,7 +74,7 @@ class Interface(cmd.Cmd):
         if line == 'current':
             pass
         elif line == 'next':
-            if self._cursor + 1 > len(self._message):
+            if self._cursor + 1 >= len(self._messages):
                 print 'There is no next message.'
                 print
                 return