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-rw-r--r--lib/sqlalchemy/sql/selectable.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/lib/sqlalchemy/sql/selectable.py b/lib/sqlalchemy/sql/selectable.py
index 9a43c404d..ce48d4c4b 100644
--- a/lib/sqlalchemy/sql/selectable.py
+++ b/lib/sqlalchemy/sql/selectable.py
@@ -741,7 +741,7 @@ class Join(FromClause):
dedupe = set(tuple(crit) for crit in constraints.values())
if len(dedupe) == 1:
key = constraints.keys()[0]
- constraints = {key, constraints[key]}
+ constraints = {key: constraints[key]}
if len(constraints) != 1:
raise exc.AmbiguousForeignKeysError(