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-rw-r--r--lib/sqlalchemy/sql.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/lib/sqlalchemy/sql.py b/lib/sqlalchemy/sql.py
index 4ab1f1871..ab46b62c0 100644
--- a/lib/sqlalchemy/sql.py
+++ b/lib/sqlalchemy/sql.py
@@ -473,7 +473,7 @@ class CompareMixin(object):
if obj is None:
if operator != '=':
raise "Only '=' operator can be used with NULL"
- return BooleanExpression(self, null(), 'IS')
+ return BooleanExpression(self._compare_self(), null(), 'IS')
else:
obj = self._bind_param(obj)