diff --git a/pandas/core/series.py b/pandas/core/series.py
index c9a72bb688270..63e6e668462f2 100644
--- a/pandas/core/series.py
+++ b/pandas/core/series.py
@@ -173,6 +173,8 @@ def __init__(self, data=None, index=None, dtype=None, name=None,
 
             if data is None:
                 data = {}
+                if index is None:
+                    index = _default_index(0)
             if dtype is not None:
                 dtype = self._validate_dtype(dtype)