diff --git a/jedi/api_classes.py b/jedi/api_classes.py
index 3dbfbc2b..249ee2e5 100644
--- a/jedi/api_classes.py
+++ b/jedi/api_classes.py
@@ -97,7 +97,7 @@ class BaseOutput(object):
             pass
         for key, repl in self._tuple_mapping.items():
             if tuple(path[:len(key)]) == key:
-                path = [repl] + path[len(key)]
+                path = [repl] + path[len(key):]
 
         return '.'.join(path)