1 files changed, 9 insertions, 0 deletions
diff --git a/lib/sqlalchemy/sql/expression.py b/lib/sqlalchemy/sql/expression.py
index 66a87c26f..071bb3c50 100644
--- a/lib/sqlalchemy/sql/expression.py
+++ b/lib/sqlalchemy/sql/expression.py
@@ -2498,7 +2498,16 @@ class _BindParamClause(ColumnElement):
         else:
             self.key = key or _generated_label('%%(%d param)s'
                     % id(self))
+
+        # identifiying key that won't change across
+        # clones, used to identify the bind's logical
+        # identity
+        self._identifying_key = self.key
+
+        # key that was passed in the first place, used to 
+        # generate new keys
         self._orig_key = key or 'param'
+
         self.unique = unique
         self.value = value
         self.callable = callable_