1 files changed, 3 insertions, 1 deletions
diff --git a/lib/sqlalchemy/sql/elements.py b/lib/sqlalchemy/sql/elements.py
index d273d9881..1447787ce 100644
--- a/lib/sqlalchemy/sql/elements.py
+++ b/lib/sqlalchemy/sql/elements.py
@@ -3209,7 +3209,7 @@ class _defer_name(_truncated_label):
     """
     def __new__(cls, value):
         if value is None:
-            return _defer_none_name('_unnamed_')
+            return _NONE_NAME
         else:
             return super(_defer_name, cls).__new__(cls, value)
 
@@ -3217,6 +3217,8 @@ class _defer_name(_truncated_label):
 class _defer_none_name(_defer_name):
     """indicate a 'deferred' name that was ultimately the value None."""
 
+_NONE_NAME = _defer_none_name("_unnamed_")
+
 # for backwards compatibility in case
 # someone is re-implementing the
 # _truncated_identifier() sequence in a custom